RV King 72" wide mattress replacement

[Offramp]

We are looking for recommendations for a 72" wide (RV King) mattress that will work well with the new to us 2012 Winnebago Adventurer 36P. The present air filled mattress hangs over the end of the bed platform about 6" and gets slightly compressed when both bedroom slides are retracted. I am guessing that a mattress that will not work with this slight compression will cause issues with slide retraction. Maybe I am over thinking this but really am looking for inputs on what works or what to stay away from.

[mack73]

www.rvmattress.com is from Brooklyn bedding and has various RV specific sizes. I got a 72" full length king for my bounder. I was able to go thicker at 8". Just watch the firmness level as it might be very stiff when you get that short.