RVs based on the 2.7 liter 5-cyl turbo diesel 2500 Sprinter (such as our LTV) are 9.5' tall including the roof mounted A/C. This has not been a problem for us except the obvious parking garage limitation. We have a garage with a 10' door and it easily fits in it. But this seems to rule it out for your purposes.
It's towing capacity is 5000 lbs. The only trailer I have ever pulled with it is a small (4'x 8') utility trailer to haul bark mulch.
The turbo diesel is quite capable of moving the RV over the tallest mountains with no problem but I suspect a trailer even close to its towing capacity would slow it down.
As an RV chassis, we have been quite happy with our Sprinter that now has 140K miles on it.
