i have the same wheels as the original poster, and spent an hour with a 7
" grinder to make them fit in my titan jacks. After all that work, it did not inspire enough confidence to actually use! I lifted the front corner with some trepidation, then started lifting the side that has one in the middle. It looked like the wheel was just going to roll off to the side and take the jack with it. I felt lucky to put it back down with out dropping the whole thing on myself.
I'd watch out trying this on an older camper.
Mine is an '88 100s from Skamper, and I suppose there may be some tender wood at the middle jack.
Be safe.
Dave