I like popups so don't mean to discourage this choice, but FYI in case you're considering other towables:
I was actually looking for a PUP when I stumbled over my present trailer, which is a standy-uppy molded fiberglass unit. Amenities are pretty much the same as a PUP, but you don't have to "pop it up" to use it. I've done a lot of traveling with it (much with my grandkids) and I can tell you that having the freedom to just stop/walk in/eat/sleep/p**/ WHATEVER is huge, convenience-wise.
I've towed it over forty thousand miles with a '97 4-cyl Kia Sportage, if you can believe it. Your Toyota pickup wouldn't even know one of these little trailers was back there!