just purchased a 2018 Bounder 36D and love it, however in South Louisiana we have these things that resemble roads that ride like your traveling down rail road tracks. Is there up grades available that would help improve the ride. Also the coach has a tendency to float at hwy speeds 60/65 max same question has anyone done shock/ sway bar upgrades and did it help? 

Jerry 

If you have a 36D, you have a Freightliner chassis with air ride suspension, and since a 2018, hope you have the V-ride suspension. If this is the case, you shouldn’t have the kind of problems you describe. Suggest you find a Freightliner Service Center, Preferably an Oasis Freightliner Service Center that specializes in the Freightliner Custom Chassis for Rv’s, and have them check-out the Chassis. You might also have your wheel alignment checked.

I have a 2018 Fleetwood Southwind 34C, F53 22K (basically a bounder 33C LX).  I have the blue safe-t-plus and it helped with freeway speed wandering.  I also added the front and rear sway bars by Roadmaster. They made a world of difference with body roll and highway speed handeling.  I have sumo springs but they are still in the box.  I'm going to instal today or tomorrow.

I'm currently trying to find a place where I can get a four corner weight reading.  I went to a cat scale and got the axle weight and I'm using the divide by 2 and add 10%.  Currently loaded, my front tires (235/80/R22.5) per the Michelin chart should be 80 psi and my rears at 95 psi.  Factory placard calls for 90 on all four.  This little bit of pressure change made a noticeable difference in combating the floating at highway speeds.

I turned wrenches for a living for a long time so I do all the work myself.  Let me know if you have any install questions and I will do my best to answer.  :)  I would "steer" clear of dealership service.  Find an independent motorhome shop with good reviews and seek their help.