yes, a Jensen should be close to the same dimensions, without doing much modification.
but you'll have to compare each unit's measurements.
do you have a hybrid? if so, most just put a memory foam topper on the stock mattress.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity