It would help us give you better answers if we knew some more about the camper. Year, make, model so we know what you have? And do you know the axle size, the dry empty weight and the GVWR of the camper? Some of this info can be in the camper manual or on load stickers pending the year the camper was made.
2" of wheel well clearance may only work if the springs on the camper are a lot heavier in rating then the GVWR. Some camper brands are set up as low riders, and usually underslung axles. But in your case, you stated the spring are over the axle, which does not fit the common thinking of low rider camper with heavy springs.
The prior owner may have overloaded the camper, as was stated, a spring broken, or the springs are fatigued from age. We have no idea if your camper is 5 years old or 50 years old. If they did overload the camper, there is an axle inspection that can be done to see if the axle tube has lost camber. And you can get leaf spring arch heights on the spring packs from the spring manufacture if you can find a tag on the springs or axle. Assuming you have leaf springs and not a torsion axle.
3" of wheel well clearance is a common guideline from Dexter axle. However, some manufactures set up campers lower then that, and they can work, but again, this comes back to the capacity of the springs verses the rated GVWR if they can run lower then 3" clearance.
The wheel well rub may have come from broken suspension (shackle failure) or a blown tire, or both to name a few by the prior owner.
Give us some more to go on, just throwing heavier springs at the camper may not solve all the issues you could be up against.
A TPM on a camper is a very good thing regardless. I use the TST system, this one,
https://tsttruck.com/ It works well for my setup. I have it on the truck also as my truck is older before TPM's were mandated.
Hope this helps,
John
