I have a 100 gallon tank in my enclosed trailer, with the delavan mounted on top. I put 30 gallons of bleach, then mix the tsp and borax with heated water, once it is disolved it gets added to the mix, but do not forget to stir it up a lot. Then once I get to the job site I add my water then clean. I usually have 40 to 50 gallons left over after one roof. That will help with your driving a tank around in your truck. If you need some back up, get 15 gallons containers and have your bleach in one with 15 gallons and 15 gallons of tsp and borax in the other already mixed, then you can make yourself 50 gallons of applesauce mix and keep on rocking if need be.