Definitely rent a trailer before you buy one. I sold my travel trailer about two years ago because I wasn't using it and really needed something smaller as the kids are grown. When we go to a mountain bike race, we just put a blow up mattress in the bed of the truck (canopy) and that's our camping.
Last winter, I did a race down in Arizona and brought my Mom. No way is she going to do desert tent/pickup truck bed camping. So I rented this little trailer. It's made by RPod. Very light trailer, easy to tow with a V6. Heat, A/C, small shower, restroom, dining folds into a queen size bed and small bunk beds at the rear that can fold away for storage. It also had a "slide" which really opened up the middle of the trailer. Probably an 18" slide, maybe 7 feet or so long. Wonderful little trailer.
If you rent, you get to try a couple of things in a "real life" situation to find out what you like WITHOUT a huge investment. You may find that you just prefer to rent.
angela
