Great points to keep in mind Martyn. I definitely was guilty of not keeping my pace down until the trailer axle made it over the same obstacle the tow vehicle had just concurred, but I learned quickly after I watched the Chaser get tossed from side to side more roughly than I would have preferred. I want to clarify the 6-inch thing. Is it six inches of total bag height or six inches total spring assembly height (including the mounts, top & bottom caps). My impression is that it's 6-inches of black bag (spring), but want to be sure.
Having just finally used my Chaser for the first time this past weekend for a brief overnight trip, I felt that for slower speed rock wheelin' where the one Chaser tire would roll off a rock and one tire would quickly pivot down and the other would pop up (twisting mostly on the rock&roll hitch), I might want to let a little air out of the bags compared to what I had (not sure if I was at 6-in, but was close) and letting tire pressure out like on the tow rig was helpful. For example, I was running 9-psi in my BFG 265/75R16 tires on 8-in. wheels on the Chaser. 4Runner had 10-psi in the fronts and 16-psi in the rear due to the substantial weight on the rear axle (two large dogs in kennel in the back of the wagon, 20-gallons gas, full water tank, tools/recovery gear in the nose box with the battery). I also think it would be nice if I changed to wheels with less back-spacing and/or different off-set to make them stick out a bit more. Right now my tires/wheels are quite close to the body, my proposed change would still have the tires well under the fenders. I thinking is to possibly add some stability, make the Chaser's track width closer to my tow vehicle, and to add clearance for chains.