Paul, the problem with the solution line been inside of the vac hose is.....
Dramatic loss of heat ATW.
Restriction of air flow.
We tried the Hide-a-hose system years ago with the truckmount, although there wasnt a big drop in air flow there was a MASSIVE difference in the heat. I would estimate that the heat on a 100 foot length was at least 80 - 100 degrees lower so we ditched the idea. If you are thinking of using the hide-a-hose on a portable running 1 1/2 inch vac hose forget it.
Richie.