My motorhome is hard to control at highway speeds.

We have a ford chassis and did the cheap handling fix on both front and rear and it did help. We then added the Saf-T-Plus steering stabilizer which helped even more. The stabilizer seemed to help with semi push and side wind. It also will pull steering back to center and help if you go off onto a shoulder. We first put on new tires, had alignment done then these other things.