I replaced my OEM mattress which was terrible with a Sleep Number RV Radius King. Since I full time the cost wasn't an issue for me and the lighter weight than a good traditional mattress was a big plus. And since the Sleep Number mattress is assembled on site, moving a large king mattress into a tight RV bedroom is a breeze. It goes in in small pieces. No problem at all. Assembly took about 30 minutes and could be done in less time if I had to do it again.