Airbags or Sumo Springs

Upon introduction (per Supersprings), Sumo Springs were designed (originally) for the up and down forces encountered on emergency vehicles rolling over varied terrain...Though similar, in my view these forces are not the same as the near constant down force weight of a heavy camper (leaving Sumos in a state of near constant compression), thus I'd opt instead for tembrens... But the 4-5" the drop you mention is substantial, and in the long run a better solution may well require a leaf spring upgrade. I recently switched from Tembrens (after 6 yrs) to adding two new leafs per side (due to rough I-5 So. Calif freeway), and have noticed a worthwhile further improvement. JMO.

Best Regards,

3 tons