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Motorhome (Class A RV)

Product

Overview

A Class A motorhome is a self-contained home on wheels built on a heavy purpose-made chassis rather than an adapted truck. The flat-fronted coach body sits over the full width of the frame, giving an interior tall and wide enough to walk through, with slide-out rooms that telescope outward when parked to widen the living space. Unlike a towable trailer, it carries its own engine, drivetrain, and driver station up front, and unlike a camper van it brings full house systems: water, propane, climate control, and independent electrical generation. The diesel-pusher layout places the engine at the rear, which keeps the cabin quiet and frees the front for a large windshield and a lounge.

How it works

The coach drives on a Motorhome Chassis of deep steel rails carrying full water and fuel loads. The rear-mounted Diesel Engine, a turbocharged inline-six, sends torque forward through the Transmission to the Drive Axle and its dual rear wheels. The Air Suspension uses air-bag springs and ride-height valves to hold the coach level whether it is empty or fully loaded, and the Air Brakes clamp disc brakes at every wheel from compressed air.

Parked, the rig becomes a residence. The Coach Body opens its slide-outs to reveal the Interior, with captain's chairs, a convertible dinette, a bed, a galley, and a wet bath. The Water System feeds fresh water from an onboard tank through an electric pump and a water heater, and collects waste in grey and black holding tanks. The Propane System supplies the cooktop, fridge, and furnace, while the HVAC heats with a forced-air furnace and cools with roof-top air conditioners. Off-grid power comes from the Power System: a house battery bank, an inverter/charger, and a genset. Hydraulic Leveling System jacks level and steady the coach on uneven ground.

Motorhome (Class A RV) parts and their functions

15 top-level parts · 391 parts in total · full bill of materials below
Motorhome (Class A RV) parts diagram: 1 motorhome chassis, 2 diesel engine, 3 transmission, 4 drive axle, 5 air suspension, 6 air brakes, 7 wheel assembly, 8 coach body, 9 interior, 10 water system, 11 propane system, 12 HVAC, 13 power system, 14 driver dash, 15 leveling system. 391 parts in 15 top-level items.
Motorhome (Class A RV) parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.
#PartQtyWhat it does
1 Motorhome Chassis 4 parts 1× Heavy motorhome chassis
2 Diesel Engine 9 parts 1× Rear-mounted diesel
3 Transmission 6 parts 1× Automatic
4 Drive Axle 6 parts 1× Rear drive axle
5 Air Suspension 4 parts 1× Air-bag suspension with leaf-spring location, giving a level ride under varying loads.
6 Air Brakes 5 parts 1× Full air brakes
7 Wheel Assembly 5 parts 6× 2 front + 4 rear duals
8 Coach Body 7 parts 1× Slab-sided coach with slide-outs
9 Interior 5 parts 1× Living quarters
10 Water System 5 parts 1× Fresh/grey/black water
11 Propane System 3 parts 1× LP tank, regulator, and distribution lines feeding the cooktop, furnace, fridge, and water heater.
12 HVAC 4 parts 1× Furnace + roof AC
13 Power System 4 parts 1× Inverter, batteries, generator
14 Driver Dash 3 parts 1× Driver dash
15 Leveling System 3 parts 1× Hydraulic levelers

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Build & assembly graph

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Bill of materials for Motorhome (Class A RV)

15 top-level lines · 130 rows shown · 391 parts total · indented to 3 levels
# Item / sub-assembly Part no. Qty/assy Ext. qty Parts Type
1 Motorhome Chassis 4 parts motorhome-rv-chassis 1× 1 12 assembly
1.1 Frame Rail motorhome-rv-frame-rail 2× 2 · part
1.2 Crossmember motorhome-rv-crossmember 8× 8 · part
1.3 Diesel Fuel Tank motorhome-rv-fuel-tank 1× 1 · part
1.4 Fastener Set fastener-set 1× 1 · part
2 Diesel Engine 9 parts motorhome-rv-diesel-engine 1× 1 25 assembly
2.1 Engine Block & Head motorhome-rv-engine-block 1× 1 · part
2.2 Piston & Rod motorhome-rv-piston 6× 6 · part
2.3 Crankshaft motorhome-rv-crankshaft 1× 1 · part
2.4 Turbocharger motorhome-rv-turbocharger 1× 1 · part
2.5 Common-Rail Injection 3 parts motorhome-rv-fuel-injection 1× 1 8 assembly
2.5.1 Fuel Injector motorhome-rv-injector 6× 6 · part
2.5.2 High-Pressure Fuel Pump motorhome-rv-hp-fuel-pump 1× 1 · part
2.5.3 Common Fuel Rail motorhome-rv-fuel-rail 1× 1 · part
2.6 Radiator radiator 1× 1 · part
2.7 Coolant Pump coolant-pump 1× 1 · part
2.8 Ball Bearing ball-bearing 2× 2 · part
2.9 Oil Seal oil-seal 4× 4 · part
3 Transmission 6 parts motorhome-rv-transmission 1× 1 18 assembly
3.1 Helical Gear Pair gear-pair 6× 6 · part
3.2 Gearbox Housing gearbox-housing 1× 1 · part
3.3 Ball Bearing ball-bearing 6× 6 · part
3.4 Oil Seal oil-seal 3× 3 · part
3.5 Torque Converter motorhome-rv-torque-converter 1× 1 · part
3.6 Gear Oil gear-oil 1× 1 · part
4 Drive Axle 6 parts motorhome-rv-drive-axle 1× 1 18 assembly
4.1 Open Differential 4 parts differential 1× 1 6 assembly
4.1.1 Differential Case diff-case 1× 1 · part
4.1.2 Side Gear side-gear 2× 2 · part
4.1.3 Pinion Gear pinion-gear 2× 2 · part
4.1.4 Cross Pin cross-pin 1× 1 · part
4.2 Axle Housing motorhome-rv-axle-housing 1× 1 · part
4.3 Axle Shaft motorhome-rv-axle-shaft 2× 2 · part
4.4 Ball Bearing ball-bearing 4× 4 · part
4.5 Oil Seal oil-seal 4× 4 · part
4.6 Gear Oil gear-oil 1× 1 · part
5 Air Suspension 4 parts motorhome-rv-air-suspension 1× 1 12 assembly
5.1 Air Spring Bag motorhome-rv-air-bag 4× 4 · part
5.2 Leaf Spring leaf-spring 2× 2 · part
5.3 Shock Absorber motorhome-rv-shock-absorber 4× 4 · part
5.4 Ride-Height Valve motorhome-rv-leveling-valve 2× 2 · part
6 Air Brakes 5 parts motorhome-rv-air-brakes 1× 1 16 assembly
6.1 Brake Disc (rotor) brake-disc 6× 6 · part
6.2 Brake Chamber motorhome-rv-brake-chamber 6× 6 · part
6.3 Air Compressor motorhome-rv-air-compressor 1× 1 · part
6.4 Air Reservoir Tank motorhome-rv-air-tank 2× 2 · part
6.5 Treadle Brake Valve motorhome-rv-brake-valve 1× 1 · part
7 Wheel Assembly 5 parts wheel-assembly 6× 6 9 assembly
7.1 Alloy Wheel alloy-wheel 1× 6 · part
7.2 Tire tire 1× 6 · part
7.3 TPMS Sensor tpms-sensor 1× 6 · part
7.4 Lug Nut lug-nut 5× 30 · part
7.5 Valve Stem valve-stem 1× 6 · part
8 Coach Body 7 parts motorhome-rv-coach-body 1× 1 64 assembly
8.1 Body Cage motorhome-rv-body-cage 1× 1 · part
8.2 Sidewall Panel motorhome-rv-sidewall 2× 2 · part
8.3 Roof Panel motorhome-rv-roof-panel 1× 1 · part
8.4 Slide-Out Room 5 parts motorhome-rv-slide-out 2× 2 25 assembly
8.4.1 Slide Box motorhome-rv-slide-box 1× 2 · part
8.4.2 Stator Assembly 3 parts + deeper › stator-assembly 1× 2 3 assembly
8.4.3 Rotor Assembly 4 parts + deeper › rotor-assembly 1× 2 19 assembly
8.4.4 Helical Gear Pair gear-pair 1× 2 · part
8.4.5 Slide Seal motorhome-rv-slide-seal 1× 2 · part
8.5 Entry Door motorhome-rv-entry-door 1× 1 · part
8.6 Coach Window motorhome-rv-window 8× 8 · part
8.7 Fastener Set fastener-set 1× 1 · part
9 Interior 5 parts motorhome-rv-interior 1× 1 23 assembly
9.1 Seat Assembly 5 parts seat-assembly 2× 2 7 assembly
9.1.1 Seat Frame seat-frame 1× 2 · part
9.1.2 Seat Foam seat-foam 2× 4 · part
9.1.3 Seat Cover seat-cover 1× 2 · part
9.1.4 Seat Motor seat-motor 2× 4 · part
9.1.5 Seat Heater Mat seat-heater 1× 2 · part
9.2 Dinette motorhome-rv-dinette 1× 1 · part
9.3 Bed motorhome-rv-bed 1× 1 · part
9.4 Galley 4 parts motorhome-rv-galley 1× 1 4 assembly
9.4.1 Cabinetry motorhome-rv-cabinetry 1× 1 · part
9.4.2 Propane Cooktop motorhome-rv-cooktop 1× 1 · part
9.4.3 Refrigerator motorhome-rv-refrigerator 1× 1 · part
9.4.4 Sink & Faucet motorhome-rv-sink 1× 1 · part
9.5 Wet Bath 3 parts motorhome-rv-bathroom 1× 1 3 assembly
9.5.1 Shower Pan motorhome-rv-shower-pan 1× 1 · part
9.5.2 RV Toilet motorhome-rv-toilet 1× 1 · part
9.5.3 Vanity motorhome-rv-vanity 1× 1 · part
10 Water System 5 parts motorhome-rv-water-system 1× 1 27 assembly
10.1 Fresh Water Tank motorhome-rv-fresh-tank 1× 1 · part
10.2 Grey Water Tank motorhome-rv-grey-tank 1× 1 · part
10.3 Black Water Tank motorhome-rv-black-tank 1× 1 · part
10.4 Water Pump 3 parts motorhome-rv-water-pump 1× 1 23 assembly
10.4.1 Stator Assembly 3 parts + deeper › stator-assembly 1× 1 3 assembly
10.4.2 Rotor Assembly 4 parts + deeper › rotor-assembly 1× 1 19 assembly
10.4.3 Diaphragm Pump Head motorhome-rv-pump-head 1× 1 · part
10.5 Water Heater motorhome-rv-water-heater 1× 1 · part
11 Propane System 3 parts motorhome-rv-propane-system 1× 1 3 assembly
11.1 Propane Tank motorhome-rv-propane-tank 1× 1 · part
11.2 LP Regulator motorhome-rv-propane-regulator 1× 1 · part
11.3 Gas Distribution Lines motorhome-rv-gas-line 1× 1 · part
12 HVAC 4 parts motorhome-rv-hvac 1× 1 28 assembly
12.1 Propane Furnace 4 parts motorhome-rv-furnace 1× 1 24 assembly
12.1.1 Furnace Burner motorhome-rv-furnace-burner 1× 1 · part
12.1.2 Stator Assembly 3 parts + deeper › stator-assembly 1× 1 3 assembly
12.1.3 Rotor Assembly 4 parts + deeper › rotor-assembly 1× 1 19 assembly
12.1.4 Heat Exchanger motorhome-rv-heat-exchanger 1× 1 · part
12.2 Heating Element heating-element 1× 1 · part
12.3 Roof Air Conditioner motorhome-rv-roof-ac 2× 2 · part
12.4 Thermostat motorhome-rv-thermostat 1× 1 · part
13 Power System 4 parts motorhome-rv-power-system 1× 1 57 assembly
13.1 12 V Battery lv-battery 4× 4 · part
13.2 Inverter/Charger motorhome-rv-inverter 1× 1 · part
13.3 Onboard Generator 4 parts motorhome-rv-generator 1× 1 25 assembly
13.3.1 Genset Engine motorhome-rv-genset-engine 1× 1 · part
13.3.2 Stator Assembly 3 parts + deeper › stator-assembly 1× 1 3 assembly
13.3.3 Rotor Assembly 4 parts + deeper › rotor-assembly 1× 1 19 assembly
13.3.4 Ball Bearing ball-bearing 2× 2 · part
13.4 Power Center 4 parts motorhome-rv-power-center 1× 1 27 assembly
13.4.1 AC Breaker Panel motorhome-rv-breaker-panel 1× 1 · part
13.4.2 DC Fuse Block motorhome-rv-fuse-block 1× 1 · part
13.4.3 Wire Bundle wire-bundle 1× 1 · part
13.4.4 Connector connector 24× 24 · part
14 Driver Dash 3 parts motorhome-rv-dash 1× 1 3 assembly
14.1 LCD Panel lcd-panel 1× 1 · part
14.2 Microcontroller mcu 1× 1 · part
14.3 Switch Panel motorhome-rv-switch-panel 1× 1 · part
15 Leveling System 3 parts motorhome-rv-leveling-system 1× 1 31 assembly
15.1 Hydraulic Jack motorhome-rv-leveling-jack 4× 4 · part
15.2 Leveling Power Unit 3 parts motorhome-rv-leveling-pump 1× 1 23 assembly
15.2.1 Stator Assembly 3 parts + deeper › stator-assembly 1× 1 3 assembly
15.2.2 Rotor Assembly 4 parts + deeper › rotor-assembly 1× 1 19 assembly
15.2.3 Hydraulic Pump motorhome-rv-hydraulic-pump 1× 1 · part
15.3 Relay relay 4× 4 · part

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Sourcing: possible vendors

Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $8k–$90k. How estimates work
VendorHQSpecialtyMOQLead time
🇯🇵Toyota
global.toyota ↗
Toyota City, JP Automaker made to order 16–28 wks
volkswagen-group.com ↗ Wolfsburg, DE Automaker made to order 16–28 wks
gm.com ↗ Detroit, US Automaker made to order 16–28 wks
hyundai.com ↗ Seoul, KR Automaker made to order 16–28 wks
🇨🇳BYD
byd.com ↗
Shenzhen, CN EV & battery manufacturer made to order 16–28 wks

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