I have been using lawn vacs since 1983 but never the PTO style. Made my own 42 bushel trailer with tandem axles and hydraulic dump. It has a unique pivoted tongue that supports the vacuum. I have owned both Trac-Vac and EZ-Vac (now Bluebird International) 8 hp units and found both to work well. The Trac-Vac uses 8" hose and the EZ-Vac uses a 7 inch hose. The EZ-Vac has a built in shredder that reduces the material to a mulch, and that is why I have it now. Some points to consider based on my experiences: (1) Vacs don't work well with wet grass. (2) You definitely have to drive slowly when vacuuming tall grass or heavy leaves to keep from choking up the hose. (3) Vacuums take a lot of power and you need to keep the RPMs up most of the time. (4) The keys to easy unloading are: (a) don't cram the trailer completely full--unload before it packs tightly and (b) have a trailer that dumps at a very steep angle--preferably 45 degrees or more. Trac-Vac trailers are designed with a taper that widens from front going back to the rear to help the load slide out more easily. This is described in their advertising literature as well as on their Website. I have not actually used one and thus cannot offer an opinion on how well it works.
Some photos of my system follow. The Tractor is a Steiner 430 powered by a 25 hp Kubota gasoline engine. The mower deck is 60 inches and equipped with high lift blades. They not only lift the grass more than standard blades but impart a high velocity to the material as it enters the hose. The vacuum unit is EZ Vac Chipper-Shredder powered by an 8 hp engine.
On the steep slopes (up to 28 degrees in some places I take the trailer), I need all the power I can get. I have just sold this Steiner and will be taking delivery of a new 31 hp Ventrac 4200 and 72 inch deck later this week. Will post photos of that setup later.
Some photos of my system follow. The Tractor is a Steiner 430 powered by a 25 hp Kubota gasoline engine. The mower deck is 60 inches and equipped with high lift blades. They not only lift the grass more than standard blades but impart a high velocity to the material as it enters the hose. The vacuum unit is EZ Vac Chipper-Shredder powered by an 8 hp engine.
On the steep slopes (up to 28 degrees in some places I take the trailer), I need all the power I can get. I have just sold this Steiner and will be taking delivery of a new 31 hp Ventrac 4200 and 72 inch deck later this week. Will post photos of that setup later.