When we looked at the Jayco model with a Murphy bed, we noticed that it didn't have a pass through front storage area and on a smaller trailer, that's a big loss of storage.
As you look at trailers, be aware that the dry weight of the trailer may not include additional items such as the awning, battery, weight of filled propane tanks, AC unit. So check weights carefully.
Years ago, we had a V6 Explorer rated for towing 5K (if I remember correctly) and we towed around 3K with it. I don't think I would have wanted to tow much more if doing any traveling through mountains. I think it would be best to keep the dry weight 4K or under. With 3 kids, if you plan to take bikes and other stuff for them, your weight with clothes, food, water etc. can quickly add up. Having been a pop-up camper when our two sons were growing up, if drying out canvas when you get home isn't a problem, I think you can get more space with less weight with a hybrid or pop-up.
You just want to be sure that you won't be stuck in a situation where you don't like the towing combination with the Nissan and can't afford to trade in for a different tow vehicle.
