Scary Handling Problem

Your rig and toad length and weights are similar to ours. When we first purchased our MH we encountered the same issues you described. After reading through this forum we made the below changes in order as posted to get an easier drive and ride, however, we don't go over 60mph, one because it's not recommended for the toad and two it's a much earier drive between 55-60mph. Our towing gear is all Roadmaster equipment.

Run the air bags at 60PSI
Front End alignment
Bilstein Shocks
Roadmaster RSS Anti Sway Bar
Roadmaster Reflex Steering Stabilizer