We have a 37B and our bed was too short. We bought a piece of foam about 8" long, the width of the mattress and the same depth. We put it at the top under the pillows and remove it when we bring in the slide....most of the time. It works fine and now my feet don't hang over the end of the bed.
2004 37B Adventurer, 8.1 WH, Ultrapower, DIY CAI, Henderson Track Bar, Tru Center, Koni FSD's, Roadmaster Even Brake, Scan Guage II, 180 Thermostat,