Does anyone have experience with adding air suspension to a Winnebago Travato (built on the Ram Promaster 3500 chassis)? I have seen offerings from Glide Rite (4 bags - 2 fore and 2 aft of rear axle) and VB Airsuspension (2 bags - aft of rear axle). Any anecdotes, specific experience with these systems, or any other advice would be welcome.