it seems that those pivot assemblies could be extended in length so that there could be 3' distance from the pivot point and main frame down to the ground. then if the axles extended the wheels out far enough there would be clearance for tracks. if you don't need the pivot design..just drop a single extension down for each wheel and add tracks. on my subframe design on my max 2 ..i could easily drop all 6 axles 3 feet down below the main frame. i would just extend the plates the bearings are on. i would still have the chains connecting between the axles though. or i could leave the axles and sprockets where they are..cut off the extra length of those axles and drop chains down vertical to new axles on those longer plates. so basically my axles like they are now become jackshafts. hope that's not too confusing. just throwing out some ideas for you.....johnboy va.