Yep, some Roo/Shamrock years had the strut on the bottom. And some had them on the top.
RV manufacturers have been trying to find the right door solution.
The original solution was the plastic T-hook, which often broke. Then came the metal T-hook which could rip out the brackets in a strong wind. Then came the gas door struts on the top, then on the bottom. Recently the friction hinges are the latest attempt, which have their own drawbacks.
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