Better go to a dealer and just look at all the different kinds. Think about your tow vehicle and what it can pull (add in weight of gear, dogs, stuff, and more stuff).

toilets are easy to clean, if you go to campgrounds a lot have a dump station on property.

size will also limit where you can get into. I have a 19' travel trailer and it can get into some of the smaller spots in national forest, plenty big for extended camping at camp sites, isn't terribly heavy.

if you are going into the mountains that is another thing to think about if your tow vehicle can haul it up the mountain and if it can slow it down coming down the mountain. If the camper has brakes, do you have a brake controller in your tow vehicle?