Back to the "could 2 women do this" issue:
Two of anything, if well-trained in communication, can do it. One person alone can do it, but adaptations are required.
Even before you buy an RV, you two might practice having the driver back the truck up to a spot which the driver cannot see while receiving directions from the non-driver. If this goes smoothly, this will build confidence.
It's best for the driver to tell the non-d what type of directions are needed. If non-d appears to be untrainable in this regard (I have observed lots of these), you'll have problems.
Perhaps a graceful request to non-d that you'd like to try it yourself first, sans director? Get out, walk back there and look and where you want to end up, put out a marker (or note to self like "my door needs to be next to that post"), get in the cab, and do it. Then reverse roles. I really think that both people need to know how to do both roles.
Best wishes for your RV future.
