Your first step should probably be to get your four corners weighed.
Once you have those numbers, there's two things to do:
1) If one corner or side has more than the RV manufacturer's recommended 'differential' in weight one side to the other, then you need to rearrange your things to try to balance the weight on that axle. (I believe this number is 10% of the RV's total weight...for example, if the RV weighs 25,000 lbs, then the differential should be less than 250 lbs, don't quote me though...check your manual). There are cases where the house manufacturer did a poor job getting this differential low in the design, and that's when all those add on products for 'stability' come in.
2) Go to the tire manufacturer's website and air up the tires to their specs for the weight. And, the advice given earlier about setting each tire to the pressure suggested for the weight at that corner is incorrect. Set the pressure to the highest weight setting across the AXLE. So all tires on that axle have the same pressure, based on the highest weight.
Once that's done, test drive on a road where you can drive in the fast lane a few miles rather than the truck lane. This avoids the ruts caused by 10's of thousands of trucks traveling that road.
Rut tracking has often caused folks to think they need an alignment when actually, it's a tire, tire pressure, or balance problem.
Perhaps you do have an alignment problem, but you should at least check these other simple things first by getting four corner weights. Usually, you can do that on a weekend at a state weigh station. They leave the equipment on even when they are closed. Many states will allow you to get weighed when they're open too. Some aren't designed for 4-corner weighing though.
