tommy, no one can tell you what your ans. is because their are too meny veriable's involved.
Do you need to move the truck's?
How much chrome,alum,ect....
Do you need to pre-spray for bug's?
Are they washed once a week or once a month?
BRUSHING SUCK'S!!!!!
You miss spot's,you leave brush mark's,you can get grit on the brush and scratch the hell out of the paint.
You will need a wheel brush
A brush for paint.
A mitt to wash the small round part's and where the brush cant get into.
If your not useing soft water your going to need to wipe the mirror's and windshield when dry.[very important to driver's].
You should be researching 2 stepping and the best soap you can find.
try
www.eacochem.com
not cheap but will neither is help.
Quick ans to your question 2 or 3 for the first 2 hr's then 2 per hour after that.