We too have been using bayleton granular. I like the idea of a tank mix, but the only problem is that you have to use the mix right away and try to guestimate the amount of product needed. Its not like trimec where you know you can just check the forecasted high temps and know that the product will be used at most accounts - even if only sparingly.
I do anticipate possibly adding a second smaller side tank to my rig next year just for the fungicides.
One good thing we added to the contract was a line for clients to sign that pre-authorized a fungicide product if noticed by one of our maintenance crews and confirmed by an applicator.
If you fail to plan ..... you plan to fail.