I have to go somewhat against the flow here.
We've had several different types, and now are quite happy using a popup.
Empty weight, 3400 lbs, slide out in the kitchen area, two kings bunks, and two spare bunks, shower, john, heater/hot water, fridge, a/c unit.
We love the thing, it's perfect for us and a couple of dogs. For some reason, all our friends keep trying to talk us into a hard side trailer, every single one, and although I'm sure they love theirs, ours works for our needs.
Other than cranking it up, the set up is exactly the same as a full trailer. Every RV has to disconnect, level, plug in, turn on gas, etc., with the popup the cranking takes me or the wife an extra minute or two, plus one minute to install the door. And if we add an electric cranking system in the future, even that'll be easier.
Mikey52 is right. A lot of dealers/owners tell you that you may not really need a sway bar/system, but there's nothing like it when you have it. Tracks perfectly, even when passing big rigs, or in windy conditions. My trailer is rated for 1/3 the tow capacity of my truck, and it has the tow/trans cooler system packages. I notice a mpg knock of 2 mpg when towing on the flat.
With any trailer, [as with a lot of things] maintaining it is the key. You just have to do it if you want problem free use. We've never had a problem with the tenting material, raising or lowering, or vermin. We have, however, been in snow and some significant storms, and had no problems. [RV's are not safe in bad weather in any circumstance, it's always best to take cover in a "real" building!!]
We'll probably never "graduate" and/or return to a hard side, but we don't feel the need either.