Two birds w/one stone?

I had this system on my pete. Used a walking floor a few times with it so i think it will work with a pneumatic not 100% sure though as ive never run one. So i appoligize if this is not infact what your looking for.

Basically there is a cap for a secondary line and you flip a switch to change modes.

Dual System Wet Kit for Dump Trailer and Walking Floor Trailer - PTO Included

 

Over the years I had one ex. dump guy who decided to use his hydraulics for pump/compressor and after time and a lot of effort was successful.

I'm away long enough that I'm not sure on a Hydro pack's ability to run a blower.

I did have a heil vacuum trailer with wet line driven vacuum pump and the tractor had to be full throttle to really make it work.

Power take off drives still run a lot of blowers because bulk carriers are cheap; how costly would a fast hydraulic drive for a blower cost?

Matlack had Wilson Equipment self-propelled transfer machines that used hydraulics to move, deploy stabilizers and operate a 'pot' on a boom suspended over the dry bulker dome lid where it would vacuum the pot full and sense the weight to interrupt the vacuum and gravity drop the contents.

It was driven by a 4 cyl cummins driving the hydraulic similar to a big rig air compressor mounted on the side of the block BUT had a rockwell clutch with the flywheel driving 6 matched belts to drive the blower....a BIG blower using 6" lines to fill that suspended pot from the railcar.

 

As long as the motor produces enough torque to start and run the blower you should be OK. I bet SW Pneumatic / SE Pneumatic has experience with such a setup.