ChristopherH. I also collect with 35 gal tanks in the back of my gator. This year I built this set up to avoid having to lift up and try to pour into the 6" holes. Not an original idea, but the bilge pump empties the dump tank almost as fast as I can pour. The pump has a built-in float switch so it shuts off on its own. It's powered by the 12V outlet on the dash of the gator. The pipe coming out of the dump tank swings from one tank to the other when one gets full.
I figured last year I had almost as much running on the outside of the 35 gal tanks as inside- this should fix that.
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Good luck this year.