I just picked up a 12v compressor at Oriellys for our rv. Actually this is the 2d one. I bought the one just lower to this one about $50, did ok up to about 65-70 psi and struggled after that. This new one has more output and a larger compressor with it. Cost around $90, but like I said have had no chance to use since I got it. Has I think it said 18ft air cord, and about the same for the 12v cord with aligator clip on the end not a plug in. Maybe take a look at it. Wally world etc didn't have anything compatible that I could see.
Forgot to add, has a screw on type of air chuck for the valve stem. Not sure you can run a standard block off chuck on these?