new mattress needed, any reason to buy from camping world?

Unless CW is the only place to find what you need.... I would try to buy elsewhere. Superior mattresses are available in many places. RV sizes can vary a bit from standard so make sure you know what you are getting. Thickness can also be an issue especially for bunks. Easy to get quality foam mattress custom sized for what you want/need. Spring mattresses could add significant weight if that matters. You can get custom sheets also.