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It’s indeed possible that the Onan would have cut out even if suspension was completely stock. You’re right in pursuing that separately.
I was mostly commenting about the negative aspects of improving one area (like roll stiffness) which comes at the expense of a rougher ride. The F-53 chassis already lacks independent wheel travel, and adding stiffer sway bars makes the sprung mass move even less independent (from side to side). Additionally, adding springs like Sumos makes the suspension stiffer, which transfers higher forces for a given amount of wheel travel, as when driving over a hole in the road.
I don’t doubt you feel the Sumos help “absorb” bumps, but they are not shock absorbers. On a large suspension impacts, they have to be more jarring. It’s simple physics that can’t be overcome.
Objectively, for any vehicle to handle rough roads with pot holes better, it needs a lot of suspension travel and relatively soft springing. Unfortunately, if they built basic motorhomes that way, they would lean so much on turns that drivers would freak out. Basically, it’s a compromise between less lean (roll) and rougher ride on bad roads.
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