Company here in town has a vac setup on the front using the Western mount as the attaching point. Really well thought out. The discharge pipe is heating duct pipe and it stops about a inch from the collection box. This allows the body to dump without ever unhooking anything.
It looks like it would be very hard to see driving though. I plan to setup same idea on front and using snow plow mount, except the unit I will use has quick connects on the discharge hose already, so I will not have hose hooked up while driving.
I have a 6hp vac unit from a Cyclone Rake that has a 15 foot 6 inch vac hose. I had two extra 10' pieces of hose that I just duct taped together to make a 35' hose just for the heck of it to see if it would work. Never skipped a beat. That was just playtime thing, no production work, but it sucked up a few big piles with no problem.