Thanks everyone.
7000 lbs weight is a standard for the larger trailer like that one. Rated on the axles which are Dexter 3500 lb.
Larger tanks for water means bafling and trying to carry water on the trailer. What happens when you get into mounting larger tanks is that when it's full, not only is it heavy but you have to be able to pull it down the road and make turns and drive around to your accounts with the least amount of difficulties. That trailer you see above only has a 285 gallon tank and when full it's not exactly light. When it's half full is where the problems with pulling come in. The water will slosh back and forth and it becomes a very dangerous situation and it doesn't matter what kind of truck you are pulling it with.
When there are accounts that require water, I've put a tank in my truck and used it on a temporary basis. If it's a bigger job, I've simply hired a pool water company to deliver potable water to the site where I have tanks liked together or a larger tank. All of which, the expense is passed onto the customer. We can even soften the water that they deliver.
Basically what I'm trying to say is that any larger tank than 300 gallons is not only heavy but it's unsafe. I'm not sure what the requirements are for the Department of Transportation as far as water hauling and being permitted to do it. I've gone ahead and gotten a class A with a tanker endorsement. Weight and proportioning and baffling the water are all concerns.
When we put a trailer together I calculate where the weight will be. I make sure that the tank goes in a spot that will make it easy to pull empty or loaded. This takes some figuring when you consider that the machines and hoses and everything you put into the trailer adds weight. If this weight isn't proportioned correctly, you'll be pulling the trailer and it will sway back and forth and create a safety problem.
Ultimately, I don't really think it's safe to carry a lot of water. Pay someone to carry the water and charge back to the customer. I've seen pressurewashers mounted on the back of a tanker truck and that's ok but for us to be running around with large amounts of water, it just isn't safe or profitable. If you look at those hose reels on the bottom, there is 500 feet of low pressure inlet hose. That's nearly a tenth of a mile worth of inlet hose... 166.67 yards. That's enough to get water from some good distances. I've paid people to allow me to hook to their water spigot. I can get 3000 gallons delivered to me for under $200.00 That's alot of washing. I think you can even rent a tank for the larger jobs.
Hope this info helps a little Big Bill.
As far as my bulletin board... I apologize. I could no longer devote the time or the money to keep it going. The store portion I may keep developing but I could not devote the time to the rest of it.
The picture here shows the tank. Of course it wasn't finished but stacked up there on the tank is just assembly stuff. That's a shelf that is removable that I place on the tank. These are very handy. I'll clean it off and get another picture of it so it can be seen better.