It would help if you indicated what brand and model of camper you have, and if it is a fifth wheel or a bumper pull.
There are many things that can cause uneven tire wear on a trailer. Over inflation of the tires, under inflation of the tires, the trailer itself might be overloaded, Spring Hangers welds could be broken, or even a bent axle.
The first thing to consider is the actual tire itself. You also did not indicate what brand and size and age your current tires are. Are they the original tires, or are they replacements. Original RV tires are almost always 100% junk tires. The very first thing a new owner with any knowledge of RV's at all will do, is go out and get known quality tires on their RV. So that is the first thing you need to eliminate. Original or after market tires? If original, they are probably just junk tires and each one is wearing different and count your blessings you have not had a blow-out yet.
The second item to consider is with correct tire inflation. Regardless if you have a fifth wheel or a bumper pull, regardless if you have tandem axles or a single axle, the tires pressure needs to be the max.
Tire pressure can be a bit confusing also. There are 3 different tire pressure ratings: 1) the pressure rating stamped on the tire itself. 2) the pressure rating of the rim the tire is attached to. 3) the pressure rating posted on the side of your camper intended for the original tires that came on your camper.
When these numbers are different, you are best to go with the lowest number, if that be the tire itself or the tire rim. But, the tires need to be at THAT max pressure .... when the tires are cold.
If you are sure your tires are inflated to the max pressure, then the next area to check is the trailer suspension itself. Look for broken welds, especially the Spring Hangers.
If you see nothing obvious broken, then you'll need to examine the alignment of the axle. With a bit of creative engineering and some simple geometry, you can determine if the alignment of the axles are correct.
If that is good, then the next culprit is probably a bent axle. Now... bent axles are hard to spot.... really. I had one, and had no idea. My RV dealership repair shop finally pointed out the difference for me. Before that, I had no clue. The axle looked perfectly fine to me. After they put the new one on, I could really see the difference.
So, to answer your question, it's not an easy answer. There are too many things that could be wrong. You'll just need to examine each item and eliminate what is still correct, until you find the culprit.
Please provide more information and especially provide what measures you've already taken.
Good luck.