I will guess that a 25-foot TT might weigh too much to rely on run-of-the-mill stabilizer jacks.
They are stabilizer not lifting jacks.
If you have to lift the trailer too much with them and your tires lose air, you could risk crunching one or more of the jacks or twisting your camper frame. If you are going to buy stabilizer jacks, I don't see any reason why you couldn't buy a bottle jack instead. One bottle jack will cost you less than two stabilizer jacks most likely.
You could jack the TT up and place it on wood or concrete blocks under the frame. If the tires/wheels are good, put them on Craigslist and make a few bucks maybe?
This would provide a more firm base and the trailer will bounce less when walking around inside.
