Good small rv

I know almost nothing about campers. I’m considering a small camper that sleeps 4, like 2 bunks and a bed. It would primarily be at our lake house for grand kids and kids to sleep in when they visit. We would probably not use the bathroom or cook in it, just a place to sleep. I don’t want it to be too big maybe 16 or 17 feet, I don’t have a lot of room. I see Jayco or forest river wolf pup are low cost no frills models. Any suggestions on what to look at or stay away from. I see a few in the 12 to 15k range, don’t need anything fancy just a bunk house.