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Good idea purman, if the jack still works and it doesn't distort the frame when the stabilizers at one end are further compressed.
I wouldn't trust the old tires not to blow out when you're under there so I wouldn't rely on them to hold up the trailer without something else raising it.
I'd think that jacking from both sides little by little would not compress any stabilizers further and hopefully provide enough room to get them off. Or, dig a hole under them would be another way if it weren't sitting on concrete.
Just lifting slightly may be enough to get the pavers out and release tension. Before anything, I'd squirt WD40 on the bolts and any part that may be frozen in place, then squirt a few more times, to allow the penetrating oil to penetrate. Then use jacks under the jacking points and raise the trailer slightly and see what happens. Two of the stabilizers are on their "knees". There has to be a pin at that point and maybe it can be drilled out to get the lower part out of the way. All of them appear to have pins to allow them to articulate and maybe all the pins can be drilled out once the weight of the trailer is taken off the stabilizers—otherwise, releasing the pin (if you can) could pop something at you with considerable force. Perhaps a bottle jack to the mounting plate of the stabilizer would help stabilize that area while working on it, but I'd be concerned about something slipping.
The most important part of this seems to me is to safely lift the trailer and make sure it is not going to move. As I think out loud, perhaps the best way is putting on new tires with just enough air in them to keep them on the wheels (if you can fit them in space) and then putting a little more air in (without hitting the roof above) to release the tension on the stabilizers. The trailer will then be supported the safest way.
And, another thought—can you take the AC cover off or the whole unit out to be able to lift the trailer higher? That may give you enough space to mount new tires, or at least lift it enough to work on it.
Gene
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