Travel Trailers with a rear bed slide... Leaks? Issues?

One thing to think about WRT a rear slide that housed a bed. Many times those mattresses fold when the slide is in. Which is fine, as long as you can actually sleep on the OEM mattress. Most OEM mattresses are horrible to sleep on. And a lot of people replace the OEM mattress for a better one.

If the mattress folds in order for the slide to come in, you can't get an after market mattress.