i am thinking about buying an existing business, it has one trailer with two hot water washers with one pumping out 5.5gpm and one with 7gpm and a 500 gallon tank and accessories. then he has an 89 international with two 5gpm hot water washers, two 500 gallon tanks and accessories. there are 10 dealerships and 45- 50 venthood acounts that come with it. what do you think it is worth?