Farmwood

I have a fair amount of 15yr old Lodgepole that I used to nurse a broadleaf woodland that are now shading them out. I thought I could go for the RHI and install a boiler at the Farm and use the Pine to fuel it. I was thinking about clearing a few acres at a time and leave them on the ground until the needles had dropped, then go out to hill and wholetree chip them when the moisture was right, and fill an adapted sileage trailer to cart them back to the shed to store. We use about 4/5000 litres of oil currently and I am told that 1000litres of oil=15m3 of chipped softwood, would that still be true for Lodgepole does anyone know, as I assume the calorific values and volumes will change using this wood. Question is.. Is there a chipper on the market that would provide a decent quality chip doing whole trees this way and is my initial idea actually going to work! If anyone has any pointers good or bad please let me know