"Originally BM ramp trucks were F350 with 390 engines (source ex BM engine builder Edd)"
Which is why I was lucky to find a 1971 F350 with a 390 that was originally built as a ramp truck.
Now, it's not a BM truck, but it is close, and it did haul 2 vintage t/a cars in the early-to-mid 70's:
Bill Maier's '68 T/A Mustang notchback
Buzz Dyer's '70 T/A Javelin
My computer fried all my pictures, but I'll take more if anyone is interested.
My partner and I have decided to part with it, so contact me if interested.