74 by 78 is considered a "rv king" size. I replaced my original mattress with a r5 Sleep Number bed. DW and I like the mattress as I like a very firm mattress and she likes it soft.
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Frank and Marilyn
2014 3402RL, Sailun S637/Disc Brakes
2015 F350 CC LWB SRW 6.7L PSD FX4
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