Do you deal with chips harboring insects that are problematic. Part of the story is to get people to want their own chips, which they can do themselves, or have you mulch their trees (mulch scoops or bucket).
Are you in a fire prone area where people would not want mulch rings?
With the BMG there is a hitch quick-pin attachment that slides into grapple, allowing you to put tow slugs on it. You'll be moving your chipper into place with it when you want, then back the truck up. You can chip into a pile at the tree. You can move a brush trailer with it (I do around the shop) and did on a big removal job with a trailer load of rakings that were better not to chip.
Maybe more worthwhile to move in the truck than put that money into an old chipper, unless you can do it yourself.
With the grapple on the mini, you can figure out the balance/ rock-over point. The operator handles/ controls are the high point on the machine. My rock over point is such that I still have 6" between the front of the controls and the rear of the truck, then drive forward with 1" vertical to spare. I can stand up going in and out during the rockover, and sometimes back it out to the rockover point Without me on it, then without moving the machine, climb on, rock it over, (if needed, drag the grapple along the ceiling of the box), then start moving again.
You will want very good traction on your ramps!. Here its much wetter and muddier, more often that there. There are cheaper ramps that will handle your weight and height. My load height is 42", if I recall. Things get exponentially shakier with a heavier machine, higher off the deck.
24-36" load height
http://www.discountramps.com/skid-steer-ramps-hook-end/p/10-14-090-05-S/ under $700. For a lower load height and weight, you have a LOT more options, homemade or new/used purchase.