We're going to the PA RV show and need a bit of advice.

Rent a few in different sizes and see how your truck tows them. While camping in the rentals decide what you want in a floor plan and what you can or can't live with. Walk around bed would be one example. Then buy a used one use it for a few years and you'll change your mind on what you want and need. By then you'll want a bigger truck buy one, then look for your next trailer.