I would surely say it is wise to research the proper tire pressure for the front and rear axles. I suspect her fronts will require less air than her rears.
As commonly stated by the RV community, after that would be a front wheel alignment done with the rig loaded up ready for a trip. It would be even better to add weight behind the driver and passenger seats to represent the people who will most often travel in it. This because the consistent extra weight on trips, influences the alignment.
After those two are addressed but the rig still wanders, then it's time for the big guns....
- heavy duty steering stabilizer
- heavy duty front and rear stabilizer bars
- heavy duty shock absorbers
- if towing, a rear trac bar.
Model 2100 is the worst with handling issues, then 2350, then 2400, and then 2351. Model 2551 starts to stabilize, 2552 is seemingly ideal with it's length to wheel base ratio. Comments of PC owners over the years seems to declare it so. I do wonder, if model 2351 was built on an E450, if the wandering issue would be less.