The new ultra light trailers are capable of being towed by just about anything, certainly a half ton truck or SUV. I would seriously sit down and see how often you plan on using it say 4 trips a year? Then factor int he cost of the purchase of the truck, registration, insurance, repair, gas etc. then I would call and find out how much it would cost to rent an RV/motorhome for those 4 trips per year and see which option comes out cheapest. I would almost bet renting the motorhome occasionally would be cheaper then buying the truck and paying for the associated costs plus buying a travel trailer and all the costs associated with it.
On a side note I talk to my neighbors pretty regularly on my strolls around the neighborhood. One of them bought a boat 2 years ago, shortly after buying the boat he decided he needed a 4wd because his 2wd truck spunout and got stuck at the boat ramp. So then he bought the 4wd truck. At first he used the boat pretty regularly every weekend he was loading up and heading out. Then after it sat for a winter he ended up having to pay to have a bunch of stuff fixed because boats don't like to not be used for extended periods, then he lost a u-joint in front drive shaft of his 4x4, then he just sort of got bored with the boat after a year and now it just sits with a tarp over it, while he makes payments on it and gets out maybe 1x or 2x a year it seems.
Another neighbor directly across the street is retired and has a motorhome. A big fancy palace on wheels really, it might truly be nicer inside than most of the houses on our block. He has got giant lazy boy chairs in it, heating, AC, flat screen TV's, thing is like living in a palace. I don't know how much he paid for it but I can only guess it was a lot. He bought it because he and his wife were going to be going to AZ in the winter to get away from the coastal rain and wind. Now it sits mostly, they go to AZ for about a month and then return home.
It just seems to be the way things go for these big purchases. People buy them thinking they will use the hell out of them and reality strikes after awhile and they don't use them and end up stuck with huge payments on something they use infrequently at best. Just something to think about.