Hi Mark,
If it is truckmount performance you are looking for you might want to look at the Scorpion, triple vacs, light weight, and plenty of psi. You can run 200ft of hose and leave it in your van. I was down at Solutions recently and had a look at this machine running, the airflow was awesome for a portable machine, sounded just like a truckmount as it whistled through the hand tool. I run a Boxxer 421 and would definately use the scorpion if I needed a back up machine.
Derek