[DocP]

You have to be careful about the size. If you buy something new that's longer than the length of the king bed that's already in there, you could have an issue with the slide closing. For example, I used to have a Keystone Retreat destination trailer. The king bed was on a slide-out, and I purchased a longer length mattress than what was originally there. As it turned out, the slide couldn't fully retract because the mattress was too long and it hit the dresser at the foot of the bed. All that I'm saying is to take things like this into consideration prior to buying something new.