I am planning on buying a Billy Goat debris loader and bolting it on the back of my trailer in the fall. There are 16 hp and 20 hp units. I would prefer the 16 because it is much lighter, easier to move. However I need enough power to vac large amounts of leaves. Does the 20 make a big difference in vac power? Max amount of leaves per property per visit 30 bags of 30" by 48" bags.