These are designed to be installed when fully-extended. If you cannot install it when the door is fully open, it's not the correct length or even the correct pounds of lift.
My large compartment doors have a 60# gas lift spring on each side. The smaller doors have 45# gas lift springs, one has just one 45# gas spring.
Compare this stubborn gas spring part# to others on your MH. It should never be strong enough to bend a hinge or even open the door against its stopping point, which is where the hinge gets bent.
This chart should help identify both length and strength of your stubborn spring. It also shows how to measure for what you really require.
You might run a search for your make/model MH for sale nearby, then look at what size and length gas springs it has installed, for comparison purposes.
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2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA.
" My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy