Before I would spend any money on bolt-ons I would do the basics first. In other words load the coach exactly as it is when you travel with full fuel and fresh water(if you fill your tanks for travel), as well as food and clothing. Then have ALL four corner weighed and adjust your tire pressure according to the manufacturer's specs. The next would be to take it to an alignment shop, while the coach is still loaded for travel, that can deal with motor homes and get a front and rear axle alignment or a thrust angle alignment. Some shops will tell you that your rear axle is not adjustable when they DO NOT have the equipment available to set the trust angle on an RV chassis. It can be adjusted.
After you have done these things, and you still are not happy with the way the coach drives, then try some add-ons, one at a time.