A class 7 truck can be upto 34000#, class 8 [Tandem rears, single steers] upto 60,000#, class 9 tandems/triples or tandem/1tag, and 1 steer and tandem/tandem will be at about 81,000#. Now those are ~max truck values, you are in north country and road restrictions (weather and local restrictions) will be the deciding factors for weight. Tandem/ tandems have huge front steers like 14-16" wide so their scrubbing can't be ignored either, but the rear will be much less than a triple axle scrubbing. Note tag axles that steer lift in reverse so loading changes while backing up [non steering tags scrub HUGE while turning]. I feel the power buggy will be your best answer. [~34 trips at full load so 2 will be needed] Alternatively an agreement with you shouldering an added share of the slightly early repair/replacement of a clearly end of life driveway, say 40/30/30% or what you can negotiate with your neighbors for your best outcome. It sounds like the drive is nearing that time now at ~50 years and a cheap method at that. Harry
OH as an after thought a bottle of spirits an a couple of glasses (1 for him and 1 for you) will help with that neighbour, and generally trying to be fair and thankful of his contribution should make things considerably smoother.