John, where you have traditionally done most of your refueling at your bases, it really wouldn't be that hard to service them. Weight is not a big deal on tractors which are already carrying considerable ballast....make the tank sufficient to run two diesel tanks and you would usually be back to the fixed fuel depot by the time it was empty.....if it runs empty you still have what you've got now.  Keep in mind that the acres between refueling are going to increase considerably because of the LP.

I had it all figured out back years ago before the power box became an option for the underpowered combine....all I think would be needed is a pressure switch in the intake to sense turbo pressure and a solenoid valve to turn the fuel on. I suppose a regulator would be a good idea. I don't think a vaporizer would really be needed with a turbo...at 350^o or so it's gonna vaporize as soon as it's injected into the intake pipe. The tank location and the fact that we fueled combines in the field most all the time back then were the holdups that kept me from ever getting it done. .

What's the price of lp now? I'm thinking this is a good idea, and I think I have most of the stuff laying around.