ProMaster 136 camper build guide

The 136 inch wheelbase ProMaster rewards good planning. Its short overall length makes city parking simple and trailhead approaches less stressful, while the boxy cargo area gives you nearly wall to wall width for creative layouts. Think of it like packing a carry on bag for a long trip. Every inch matters, and the order you place things in makes the difference between clutter and calm.

Space planning that fits a ProMaster 136 camper build

A successful ProMaster 136 camper build starts with a clear layout. The interior width allows many people to sleep side to side without flares, which frees up floor length for a galley and storage. Measure your height at shoulder level to confirm fit, and consider sculpted wall panels to capture extra inches. A raised bed with a gear garage below suits bikes and bulky bins, while a convertible bed dinette offers daytime seating in a smaller footprint. If you cook often, a curbside galley with a compact fridge, induction cooktop, and deep sink keeps traffic flowing. If gear rules your life, prioritize a taller garage with tie points and a narrower galley.

Dimensions that drive decisions

Typical cargo width is about seventy five inches with roughly fifty six inches between wheel wells, so many sleepers can go side to side. High roof models allow most adults to stand. Floor length is short compared with longer vans, so keep furniture shallow, use wall mounted cabinets, and choose a sliding table over a fixed one.

Bed choices for daily comfort

Fixed beds create a predictable mattress and an easy gear garage. Convertible beds open floor space for yoga or work, but require daily setup. A hybrid approach uses a short fixed platform with a slide extension for sleep, collapsing during the day.

Galley and storage strategies

In a 136 wheelbase, a slim galley depth around eighteen inches keeps aisle space usable. Overhead cabinets should be short and shallow to avoid head bumps. Use every dead zone, including above the wheel well, in the step cavity, and within a false floor. A compact cassette toilet can slide beneath a bench to preserve floor plan flexibility.

Power, water, and climate for a 136 build

Electrical systems in a ProMaster 136 camper build benefit from minimalism and efficiency. A two to four hundred amp hour lithium bank, a DC to DC alternator charger, a shore charger, and two to four hundred watts of roof solar cover most weekend and light full time use. Keep cable runs short, mount electronics on a service panel for access, and ventilate the compartment. Choose low draw appliances, including a high efficiency compressor fridge and induction that sips power when paired with a proper inverter.

Water system sizing

Fresh water tanks in the twenty to thirty gallon range balance capacity with weight. Grey water can be ten to twenty gallons internal or underbody, with a manual or electric drain. Quick disconnects for outdoor rinse help wash bikes and muddy dogs without wetting the floor. Insulate lines that pass near exterior skin to reduce freeze risk.

Heat and cooling options

For heat, gasoline fired air heaters integrate cleanly with the ProMaster fuel system and sip fuel. For cooling, a twelve volt rooftop unit or split system can maintain comfort if the battery bank and alternator charging are sized correctly. Pair climate control with real insulation and air sealing to reduce cycling and noise.

Insulation and ventilation

Havelock wool or automotive grade synthetic insulation paired with sound deadening reduces drumming and helps temperature stability. Avoid trapping moisture by allowing drying paths behind panels. A roof vent fan near the bed and a second intake up front creates quiet crossflow. Add awning windows for shaded ventilation when parked.

Driving dynamics, safety, and gear fit

The ProMaster is front wheel drive with a low floor, which helps entry height and interior headroom. Use that advantage by mounting heavy items low and centered to control body roll. Weight distribution matters; place the battery bank over or near the axle, and keep tall cabinets on opposing sides balanced. A one to two inch lift with all terrain tires can improve approach angles, while still clearing parking garages if you choose a low profile roof fan and slim solar panels. For bikes, a vertical mount in the garage keeps bars clear and leaves room for a drawer. Surfboards fit under a raised bed if you run them nose forward and angled. Use L track or a smart floor rail system for safe tie down points.

Safety ties the whole build together. Bolt through the body with appropriate backing plates, use closed cell foam behind brackets, and isolate dissimilar metals. Protect circuits with correct fusing, grommet every pass through, and test emergency egress paths before trim goes on. Noise control is part safety too; fewer squeaks means fewer loose fasteners over time.

OZK Customs builds ProMaster 136 vans every season, so if you want expert help tuning the layout to your height, hobbies, and travel style, consider a consultation to set the plan and timeline. For an overview of how we approach lifestyle first design, explore our Recreational vans. If you already own a ProMaster and want a start to finish transformation, our Custom build van process covers design, cabinetry, electrical, plumbing, racks, lighting, and handoff. If you are shopping for a platform that can finance, review our Mainstream vans options to match budget with goals.

You want a ProMaster 136 camper build that feels simple, quiet, and ready. OZK Customs can handle the full build or a focused upfit for power, water, cabinetry, suspension, roof racks, lighting, and Starlink installation. Visit us in Fayetteville Arkansas, walk through Adventure Point, and see materials, power systems, and layout mockups in person. Tell us how you travel, and we will turn your 136 wheelbase into a clean, reliable rig with the right gear in the right place.