To be honest I bought a cheapo off Amazon and control the flow through my ball valve. Use your typical wash/wax from Auto zone and it goes forever. I keep my ball valve about half way open when foaming then switch to my jrod for rinsing.
I don’t do any fleet washing but i wash my two trucks, Jeep, enclosed trailer and two motorcycles every Sunday haha I have an addiction and need my stuff shining. Take about 1.5 hours for all to be cleaned inside and out 
Dang dude. You’re the next Jay Leno
Bought it 3 years ago
About $200 it’s stainless food grade.
Use it on homes and driveways.
It foams, saves you on chemicals, time and does an awesome job.
Used to do fleet fuel tankers, and food trucks i would use it to foam them. The chemicals stay in place longer.
A regular car wash soap from autozone is good to do truck fleet washing? Do those products create enough foam (with a foam cannon)?, or do you use some time of surfactant (i dont know how you spell that)… i have read that some people use dish wash soap as surfactant…
Because the way I mix mine I have to wash down the detergent.
So both chemicals have to have the same density. If not one pulls, while the other doesn’t.
I am thinking of running 2 injectors one before the reel and one after with a whip.
I suggest using “road show” to start with, search it, it’s a MTM brand
