I take mine on the beach frequently and I undercoated my rig myself last season.
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I have the full Kelderman airbag setup for the rear of my PC. It does help with the ride massively, but also allows me to level the RV and lower/raise it for towing. I also have bags in my front springs.
Were the rear leaf springs removed or is it the 2-stage setup connecting their rear shackles to the air bag mechanism as shown in the pic in the Kelderman link? Thanks.
"Replacing" the rear leaf spring suspension with a full air ride suspension is designed to improve the quality of the ride, making it more comfortable. The problem with these types of suspensions is that if there is a failure with an air leak of any kind, the vehicle is incapacitated.