My truck's payload rating is 3300lbs and my tongue weight is ~2900lbs, so with hitch and everything I'm right around the limit.
mkirsch -- you may be right, and for all I know I'm not bottoming out. I've just never towed a heavy fifth-wheel before so I'm hyper-sensitive about everything I feel. On the bigger bumps I get a notably stiff "hit", but it's not violent like what I'd expect if I was hitting the jounce bumpers. I then get a bit of up-and-down while the suspension settles. I'm just looking to optimize the suspension response for towing heavy without affecting ride height or unloaded performance, and with a relatively simple solution (i.e. not airbags).
I certainly like the concept of the Sumo Springs -- any real-world testimonials?
