I built a box to go at the foot of the bed to support the longer mattress. It is the same height as the board the mattress is on. Then I proceeded to put a full size residential queen in our 26BH. Being 6'6", this was the best thing I ever did. It made it a tight squeeze to walk around the bed, but sooooooo worth it!!
2014 Jayco Eagle Touring Edition 28.5BHDS
2013 RAM 2500 Crew Cab 4x4 6.7L Cummins Diesel