Recreational Vans

ProMaster 159 Extended Layouts

Dimensions that shape your plan

The Ram ProMaster 159 extended gives you a long, box friendly canvas. Its near vertical walls and generous interior width allow creative sleeping and storage options without awkward curves stealing inches. The high roof version offers standing room for most adults, plus overhead space for cabinets, fans, or a compact air conditioner. Sliding and rear door openings define traffic flow and determine where furniture should not pinch movement. Before sketching any plan, measure your specific van because trim packages, insulation thickness, and aftermarket wall panels can change usable space.

Cargo width between bare walls typically supports many transverse bed solutions. Width between wheel wells is narrower and dictates where large drawer modules or bikes can slide in and out. Interior length on the extended body opens room for a full time bed with a separate lounge, or a longer galley paired with a compact bath. The straight side walls mean upper cabinet runs can be deeper than in more tapered vans, but keep aisle width comfortable. Roof real estate must be shared by fans, solar, possible roof air, and rack space for boards or boxes, so plan that footprint early.

Key measurements to verify

Width at bed height for west east sleeping
Width between wheel wells for drawer or bike clearance
Interior height after insulation and ceiling finish
Door opening widths for fridge, shower pan, or long cargo
Roof component spacing for fans, solar, and air conditioning

Spatial constraints you must map

Wheel well intrusions near the rear third of the cargo area
Step in at the slider and how the step eats into galley depth
Rear door swing and latch clearances for tall cabinets
Window placements that affect cabinet heights and bed headroom

Proven floor plan patterns for the 159 extended

A fixed platform bed over a gear garage is the most common pattern because the ProMaster width allows many sleepers to go west east and still keep a clean aisle. That garage swallows bikes, boards, totes, and power modules. If you want a social lounge, a convertible dinette or U shaped rear seating can turn into a nightly bed, freeing more mid ship room for a larger kitchen or a compact wet bath. The extended length makes dual zone living practical, with cooking near the slider and resting in back.

Bathrooms vary from full wet bath enclosures to cassette toilet pods that slide from a bench. If you prefer an indoor rinse without dedicating a big footprint, a compact shower pan under a removable floor grate near the slider can work with a privacy curtain. Galleys run from short single block kitchens to long counters with a cooktop, sink, and a 12 volt fridge drawer stack. Windows define how bright and open the space feels; pair an awning style window above the galley with a slider window opposite to create cross breeze with a roof fan.

Sleeping arrangements that fit

Transverse queen for many sleepers thanks to interior width
Longitudinal twins that convert to a king for maximum flexibility
Lift bed on linear actuators to create a tall garage when needed
Convertible lounge with cushions that bridge for nightly sleep

Kitchen and storage zones

Driver side full length galley keeps the slider area open
Opposing short galleys create a wide aisle and balanced storage
Pantry towers near the rear doors keep heavy items close to the axle
Overhead cabinets on one side only prevent a cramped feel

Systems planning for comfort and safety

Power systems should be sized from actual loads, not guesses. Add up daily watt hours for fridge, lights, fans, pumps, outlets, and any induction cooktop. From that budget, size lithium batteries, solar, and alternator charging. Many owners combine a roof fan with a compact air conditioner for summer trips and a fuel fired heater for shoulder seasons. Vent placement matters; a fan over the bed and a second near the galley can pull cooking steam out fast.

Fresh and grey water tanks live inside for freeze protection or underbody for maximum interior space. A common approach pairs a modest fresh tank with a smart water filter and quick connect ports for outdoor showers. Keep heavy batteries and water tanks low and near the center to protect handling and braking. Every van should be weighed at each corner after the build to confirm axle loads and tire pressures match the real world condition.

Electrical and climate details

DC first design with right sized inverter only where needed
Alternator charging ensures power on cloudy stretches
Roof fan placement over cooking and sleeping areas
Fuel fired heater near the floor for even warmth
Thoughtful insulation paired with controlled ventilation

Water and weight management

Indoor tank placement for cold climate use
Serviceable plumbing manifolds with labeled valves
Grey water options with quick drain and smell control
Corner and axle weight checks to validate distribution

Build it right with OZK Customs

If you want a layout that feels dialed on day one, work with a shop that knows how the ProMaster 159 extended behaves on real roads. OZK Customs designs and builds complete custom vans that balance living space, cargo needs, and system reliability. Explore our recreational vans to see the approach we bring to fit and function. Ready for a one off plan and execution with curated components and clean integration? Start here: custom build van. Looking for a finance friendly platform path with practical layouts? See our mainstream vans options.

At OZK Customs you get thoughtful space planning, proven electrical and water systems, and a handoff experience that ensures you know every switch and valve. Our team builds for long range travel, trailheads, and family trips, always with safety and serviceability in mind. Tell us how you travel and we will turn those needs into a ProMaster 159 extended layout that works every day on the road.

Share your travel goals and must haves, and we will craft a layout, select components, and deliver a finished van built for the way you move. Fill out the form to start your build path.