3 Man Mechanics

[reff4e]

Are any associations still working 3-man crews on youth and middle school games? If so, how do you set up for scrimmage plays? Although the 3-man mechanics on the NFHS website puts one wing official (L) on the LOS, with the R and U working wide opposite him in the offensive and defensive backfield respectively, most crews here (Charlotte NC area) work a referee and two wings.

Are there any other variations on these mechanics, and if so, what are the pros and cons? I hate the 3-man stuff (feel like our coverage is lousy), and would like to hear any ideas on how to provide better coverage in this system!!