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"Portage wheels or mechanical assistance are only permitted over the following areas: International Boundary, Four-Mile Portage, Fall-Newton-Pipestone and Back Bay Portages into Basswood Lake, Prairie Portage, and Vermillion-Trout Lake Portage."

Agree with Mad_Matt that you should check with the Forest Service.  ADA has provisions, but doesn't necessarily superceed the FS regulations, as legally it appears to be a grey area.  Don't know the rangers out there this year, but past experience has shown them to be extremely reasonable.  IF you ran across them, I doubt they would even begin to take issue with you.  The above regulation more aptly pertains to use of a wheel for transportation of canoes & other gear, not persons with disabilities.  Obviously, no motorized scooters or wheelchairs are allowed.  I like the game carrier idea, or a fold-up wheelchair.  Just don't use the wheels for transportation of ANYTHING else, however tempting it may be, and be sure you stick to existing trails.  Practice leave no trace.