Lab you can cheat,, Bending quarry back round for the dogs thats getting straight lined or total out run, Running them down afew laps of the field ect iv seen it all done and that anit the right way of doing it IMH, We always hang back and let ONE dog do all the work you stay with them just enough to keep them in the beam and the dog does the rest that our way anyway...
Theres a few tricks that make it easyer by the car and ya the answer is it is easyer by the car that why so many do it ALL my best bags have came by the car, Dont get me wrong i like walk aswell i tend to walk on my own