With my tug (Kluger) and van (Expanda 12) I haven't had a need (or didn't think I had a need) to fit a load levelling system. Being a novice van tower, I have seen plenty of posts re WDH systems fitted when towing bigger, heavier vans. As I'm looking to upgrade my van sometime in the future to one around 16-17ft but still towable within the tow capacity of the Kluger (2000kg) which is seeming to be a challenge in itself. Is an airbag suspension system an alternate for a WDH? What are the major pros/cons?