Towing 10k+ with a 'Burb.......Duraburb or ??

Since there doesn't seem to be an obvious ideal solution, perhaps the best thing to do is to stick with the truck you have for at least the next camping season and see how it works out once you've got 3 kids. Right now it is just theoretical as baby #3 is not yet here. Try your truck and see how it works. I know you probably want to move to something with more power since you're unhappy with that, but I think it is probably adequate enough to test the idea of sticking with a crew cab truck. If you rush into something, it may just be an expensive mistake. I wish you the best in figuring this out.