Yep. No trucks allowed. The women themselves need to be completely natural. No dyed hair, no body shaving, no makeup (berry juice around the eyes and lips is OK, but only non-GMO, non-artificially bred berries). No textile based clothes either, just large leaves or animal skins.
I didn't think of the truck as the harvesting had nothing to do with the intended and normal use.
Hair dye--certainly not at that point of the trip.
Shaving--I don't know but I doubt it.
Makeup--I doubt it.
This was before the GMO era.
As for their clothing--I know they were topless and they pretty much had to be wearing footgear, beyond that I do not know. (In the unlikely event of meeting another vehicle on the road they could have ducked down. Everyone in our group had already seen them naked multiple times at that point anyway.)