I've thought about and rejected the donor vehicle concept. I want the latest tech and appliances in this new rig.
For example, I'd install a danfoss compressored AC/DC marine fridge/freezer without the LP hassles. 16 gallon water heater, Solar panel system, super efficient heat pump.
I'll leave the compressor in the tow rig and put a tank in the trailer, along with the control valves. It would either have automatic or manual setting. I can get speed information from the VSS signal on my PCM. Once the speed drops below 10 MPH, I could have it go to a high position.
I am settling on the 96" width for all those reasons you mentioned, and also due to the length.
The really cool part is the weight savings. I'm trading labor and higher cost materials for weight. I have a goal of around 6000 pounds dry
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears