60 feet overall length with a 48' trailer? That would be a 12' long truck (well from front of trailer to the front bumper), while most have a longer wheelbase than 12'.
Anyway anything over 40' would prove difficult to park in a National Park. Heck I only found one open space for my buddy's 40' Country Coach in Sequoia NP in 2010. Most sites are not that large. Lucky for me, I arrived on Friday morning.
What about the trees with low hanging branches? I find I scrape with a 11'4" tall Bounder.
As for the compressors, if the freon lines are sized correctly, then the oil will return, even if going uphill, or a longer distance. With a 3/8" suction line, the freon gas will be moving about 800 feet per minute, and bring along any oil with the freon! So all the compressors can be mounted on the nose. I would also be recommending putting the generator on the nose too. Sometimes a TK unit will have a generator and 480 volt compressor in the nose mounted refrigerator unit. No reason you can not use the generator from a TK, just would need a step down transformer. It is compact, and runs on diesel. Red fuel is pretty low cost too!
I had always considered a larger solar system and 5 KW battery bank, I would not need a generator. You might find the same holds true. The only time I would run my generator is while running the A/C. If your truck will have a 100 amp 24 volt alternator for the starter motor, and 12 volt alternator for the lights and other systems, it will work well to run those two voltages in the RV as well. That is what my buddy does in his MCI. He can run one rooftop A/C with his 24 volt 2,500 watt sine wave inverter while driving down the road.
Many new MCI conversion busses do not have engine driven A/C anymore, just run the 20 KW generator and 5 or 6 rooftop A/C units! It is not uncommon to run 3 rooftop A/C units on a 43- 45 foot long DP.
Good luck!
Fred.
