Backing; As a retired cross country trucker that is accustomed to hauling over demention loads, and a fellow Rv'r my suggestion is; The driver should scope out everything and have a plan of attack. The spotter should stand where they have a clear view of the mirrors. IF YOU CANNOT SEE THE MIRROR, THE DRIVER CANNOT SEE YOU. HAND SIGNALS;YOUR HAND SIGNALS SHOULD BE TO THE SIDE OF YOUR BODY, NOT INFRONT OF YOUR BODY. A WAIVING ARM IS MUCH EASIER TO SEE THAN SOMEONE CURLING THEIR LITTLE FINGER. Think about standing where you think the left rear corner of the coach should be. This gives the driver a reference point. If you do this, do not argue before driver backs toward you.har har. Stand in front of the vehicle also helps especially if there are obstructions near the rite front. Point left or right if the driver needs to make corrections. If to close to something, get loud and verbal. Be watching for plumbing hookups, tree limbs and things that may cause tire damage, like corners of a concrete patio.