Melissa with your mattress (the original one in the 5th Wheel) did it over hang the platform that it sits on?
can't remember priced out a mattress the other day and if it fits would work
we also put a memory foam topper on the mattress when we first got it...and slept well but for some reason
it was really worn so was going to replace it then friends gave me this I wish I still had the old one
thanks for the information
sheila