Welcome from Wisconsin. Even though you're looking for something small for the 2 of you the first consideration is what are you going to tow it with. Last year we downsized from a 37' 5th wheel to a 20' TT. It's tight but works quite well for the 2 of us and the dog. Easy to tow, easy to find a campsite to fit into, etc. Ours has a fiberglass roof and it's really easy to clean. Just wash it like I do the rest of the camper which is fiberglass. There's alot of units for you to consider based on TV, budget, wants and needs, etc.
Good luck with your search and take your time.