You might want to take a look at my EZ Dump Lawn Vacuum. After many years getting fighting almost two acres of leaves from over 60 oak trees I finally came up with a system that really works. The conventional lawn vacs all did a good job of sucking up leaves and getting them in the container but getting those packed leaves out of the container was not easy and the older I got the harder it became. My first attempts at making the job easier consisted of winches, sliding devices, and cranks and cables none of which worked well and wound up in the junk pile. The challenge as I saw it was to get those leaves out of the tow behind container without leaving the seat of the lawn mower. The sticking points was removing the hose going to the container and getting the tailgate out of the way. I finally came up with the idea of an interior dump bed which would get the leaves out of the container without moving the outer shell of the container. After much trial and error(mostly error) I came up with a small cardboard model which seemed to work. To make this a short story; after many years and 4 prototypes my EZ Dump is now in production. Then I did the really hard part which was getting a patent which was finally granted in May 2013. For a look at a video of one of my prototypes go to youtube and type in EZ Dump. Three production models will be ready by December and will hit the spring lawn and garden shows around Lebanon Missouri to promote them. Would appreciate any comments.