I could see this machine working well for a couple of reasons. One is that you downstream your hypo with one machine running and use the two machines for the super fast rinse after dwell time is over.
A 35 gallon tank does seem small and probably should have two inlets for two hoses. With two hoses running into it you should be okay unless you are on the trigger all day. Hauling that much extra 3/4" hose might be a pain though.
The price seems fair but I would want a trailer that could hold a surface cleaner and all that hose. I don't even seen holders for chems. Humping them into the back of a pickup gets real old.
Anyone else have ideas how this rig could be improved? The base system seems like a good idea as BIG GPM is a big timesaver but it looks like half a trailer to me.