One big thing you need to do is build / get a vac release, with out that you will certainly implode, collapse, crush, damage or ruin most tanks, hoses and what not, you need to get one that not only can handle your particular level of vac power but one that can handle the cfms as well.
My system was purchased from Jerry at pressurewasher.net 1-800-400-clean it is 450 or so cfm at 16" and when you put the vac relief into full force you can see the drums pull into themselves.
I often run 600 foot of 2" with no problem, and it runs all day long like that. I will say that there is a certain amount of engineering that goes into building these systems, and maybe some modification could be done by the end user to meet their particular needs, but over all, it is probably a better idea to buy one from a manufacture.