With a fifth wheel, you will have stairs from the bedroom and bathroom to the living room. Travel trailer can be pulled by any F-250 while a fifth wheel might require a more gas hog F-350 or dually. Hitch weight can be as much as 3,000 pounds - and a Montana might have 4,000 pounds when wet and loaded with a full timer's stuff inside.
My guess is that your truck will become the daily driver, and you don't want a gas hog just to pull the fifth wheel a few miles a year. The F-250 should get better mileage.
It might be difficult to find a travel trailer with dual air conditioners. I would highly recommend them if you like to sleep at 72- 75F temps. I have a 30' RV with dual pane windows and fair (1.5" foam) insulation. In Mesa AZ, I would leave the A/C on 24/7 and still not go below 85 inside when it is 110 outside and nearly 0% RH. You will use a lot of your cooling ability just to remove humidity from the air.
Many travel trailers can have a 14" square vent removed and new A/C installed. I would be looking for a 50 amp service to the trailer, regardless of it being travel trailer or not. You probably will want to run the water heater on electric, and also be able to make coffee and run the microwave at the same time. This can happen in a 50 amp RV, while a 30 amp RV you have to be careful not to run to many 10 - 13 amp appliances at once.
If you don't plan on moving the RV much, many dealers or even a private seller can park the RV on your campground site, then leave it there. If you want to go camping, then get something like a
Aliner.comFred.
Good luck!
Fred.
Money can't buy happiness but somehow it's more comfortable to cry in a
Porsche or Country Coach!
If there's a WILL, I want to be in it!
I havn't been everywhere, but it's on my list.
Kangen.com Alkaline waterEscapees.com