Ya, I had this happen on a car too. Turned out to be the steering lock in that case. But not this time.

I'm going to sleep on it and work more tomorrow.

People can keep posting so I know what to try in the morning.

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Current
2006 E320 CDI, 57K bought at 67K "Liesl"
1986 190E 2.3-16, 198K bought at 56K "Brigitta"
1987 300TD (Chuggin Along), 292K "Friedrich"
1995 E320 Wagon, 200K "Louisa"

Past
1987 300SDL, (sold) 125K, bought for 1$ "Kurt"