Those RPF1s,
strong as they are on paved roads/tarmac, were not meant for gravel/dirt roads
any rougher (even at slow speeds) than what you show in the pics above.
There is a reason you never see them on any of the ARA gravel stage rally competitors' Scoobies (or anything else), whereas the Enkei gravel wheels (as well as Speedline, Method, and Braid gravel wheels) abound on the stages.