How to move and transport an 80 gallon compressor?

Agree on VERY top heavy.

Agree on "drain the oil" (but remember to put it back in)

I made skids for mine out of 4x4 and 2x4 stock about 30" (same as pump and motor shelf).
Made it MUCH easier to deal with the top heavy factor and to "walk" in order to move it by my self.
Also easier to operate drain.

I've spent my entire life figuring out how to do "two man" jobs with only one man.

My Dakota R/T is low, so the "tailgate fulcrum" is a bit easier for me.

IIRC I used ratchet straps and a cement set 4x4 garage door frame to winch it back upright after getting it home and installing the skids. Now I can walk it pretty much where ever i need it including onto a 5x8 lawn equipment style trailer.