Reliable camper

You are in the used trailer market - so everything you find will be reliable, the kinks worked out. It's then a matter of how the previous owner treated it. I have a 5th wheel, with bunkhouse. Bought it used about 6 years ago, so long before the COVID price increases. We have had to do a few things to it. The biggest thing I did wrong was not have it inspected before I bought it. I would do that for sure. Look for water leaks, and any appliances not working, make sure it is the floor plan you like and has never been damaged. Mine had a water leak, but we fixed it and it has not caused any more problems. Look for professional repairs, not DIY, some DIY looks professional and that's good. You have a good truck for a large enough trailer for your family, so that's a good start.