I think that 'rocking' leveler is for trailers. You need to support both dual wheels not just one on each side.
I started to carry a double set of wood blocks 2x8's as a back up for my hydraulic levelers.
However, since i installed two bubble levels inside my cab with a view of both from my drivers seat, I can usually make it level without using anything.
Just park the rv on a known level spot, then install one level onto the dash offering R-L and the other level I mounted above the passenger seat offering Front-Rear leveling. Most of time I just need to move a couple of feet to make it level.
Being on the 450 chassis makes it heavy enough to limit rocking when walking around inside. I hardly ever use the jacks for stability. I exercise the jacks periodically to make sure they still work.