First off, I happened across an unfortunate
report from the National Institute for Occupational Health and Safety about a volunteer who died after falling off an aircraft tug. It appears to have happened at the Yankee Air Museum given that the report notes it happened in Michigan and the yellow tug in the picture matches the yellow tugs from YAM above.
Coleman Unknown at the Wings of Eagles Discovery Center - marked as "77L 344"

MD-3 at the Pima Air & Space Museum

Cletrac M2 at the Imperial War Museum Duxford

While technically a "transport" and not an "aviation" museum, I believe the National Transport & Toy Museum still fits here:
GSE at the National Transport & Toy Museum- Belt Loaders
- 1988 Daihatsu Delta V57PWS
- 1970s Hastings-Deering Air Stairs
- Kairangi Tow Tractor
- Mercury 8330

- Unknown Tug - previously used by Air New Zealand, marked as "10004500" and "??053", possibly the Kairangi Tow Tractor above

- Unknown Tug - seen to the left of the tug in the above entry, possibly the Kairangi Tow Tractor above

- Unknown Tug - marked as "Southern DC3", possibly the Kairangi Tow Tractor above
