If you have any RV parks or campgrounds near your house take time to talk to owners about what they like and dislike about their current and any past trailers and tow vehicles. Then you can decide if they apply to you both.
To me the most flexible RV setup is a pickup with a crew cab (seats 5 adults) pulling a travel trailer. The truck with a cap can hold bicycles, camping gear, a boat, and all the other items you do not want to hang off the back of the trailer or have to store inside. The rear seat of the cab is great for putting items you want to be able to get to without stopping and going inside the trailer, like raingear, snacks and beverages in a cooler, photo gear, and the like, or pets.
A big advantage of trucks is that they are built for towing and will better handle the trailer in every respect. A 1/2 ton truck will be adequate for a trailer under 8,000 lbs and provide a smoother ride than a heavy duty truck.
You can download trailering guides from all the manufacturers' websites and other sources that will provide exact information on the load capacity of different vehicles. I would not trust a salesperson at a RV or auto dealer for accurate information.
