8 mile level loop with 2 different rods

We signed up for an 8 mile level loop (4 miles each way). We are already running a bit behind schedule. I was thinking of running a 3 man crew. One instrument man on the Trimble DiNi and 2 rodmen, one rear and one forward. Each rodman will have their own rod (same exact model).

This should obviously speed up the operation but my concern is if the 2 rods read, lets just say 0.005 different that could accumulate a significant error if we will have 150+ setups. (150 x .005 = 0.75')

Thoughts? Concerns?