I haven't measured mine, but here is some info I pulled from California DMV code.
A left* and right* hand outside mirror is required on the towing vehicle
if the RV or trailer obstructs the driver's rear vision. Make sure the
mirrors are large enough and that they are positioned for vision at least
200 feet to the rear of the vehicle. You need the mirrors to do more than
back the vehicle. Check your mirrors frequently for traffic conditions
behind you so you can avoid last minute maneuvers and surprises. Side mirrors
should be as large as practical, with a separate convex mirror mounted below.
Mount the mirrors as wide apart as possible for maximum rear vision and easy
backing. Trailer towing mirrors should be adjusted so that the inside edge of
the mirror is further out than the outside edge of the trailer. The RV or
trailer's rear wheels should be visible in the convex mirrors to check for
correct tracking.
Lights, mirrors, or devices which are required to be mounted upon a vehicle
under this code may extend beyond the permissible width of the vehicle to a
distance not exceeding 10 inches on each side of the vehicle.
The total outside width of any vehicle or its load shall not exceed 102 inches
It seems to me that if you have your mirrors sticking out the maximum amount of 10 inches on each side and you still can not see behind you then you need a wider tow vehicle. But I am guessing. I am not a lawyer
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