I use an Airflex Pro custom as a van mount, It started off as a series machine and I have modified it to run in parallel with two 1650w Electro motors so it is really more like a Storm now. In its original series form I would say It would not work well as a van mount however now it works amazingly well and even with faffing about with cords it saves a massive amount of time and runs out to 100ft regularly with no problems at all.
There is no reason an Enforcer set up in parallel should not do exactly the same thing with excellent results, My Airflex is easy to van mount as it will suck directly from a tank. The enforcer will likely need an extra pump to feed the enforcer tank from the van mounted tank.
Mounting the machine in the van has been one of the biggest time saving exercises I have done so far. I have no doubt a real truckmount will provide even better time savings but for the tiny investment of mounting a suitable porty in a van, its hard to beat. I'm so impressed by the power an electric machine can provide my next purchase will be a Mytee escape.