We have the Bomgaars 25 gallon sprayer, but ditched the metal brackets that are supposed to mount it on your rack. They pinched the tank and caused leaks the first couple of years, so now we mounted the tank to the rack using a 2x12 and drilled out holes where needed. MUCH more stable, and mounts a little higher when beans are taller for that second spraying.
Our plots are also a bit remote from running water, so we recently picked up a 65 gallon tank that can be thrown in the back of a pickup, so we can now spray all of the plots without having to make a 2 mile run back to the place for water. Just thought I'd throw that in incase someone else was in the same situation.
NWBuck