I agree with Chris. Yes brushing/agitation will always make it look better. Depends on what they want and what their willing to pay for it.
For the most part, most companies just want a 70 mph truck wash.
Be careful what you buy, a lot of companies claim to have a "brushless" truck soap but it's not.
Russ Johnson with Southside Equipment sells a good truck soap and aluminum brightener for 2 stepping.