an ambulance contractor known as Amblewagon (and as Automotive Conversion Corporation) of Birmingham and Troy Michigan built the first dozen altered wheelbasen (A/FX) Mopars in 1964.

http://www.thehemi.com/notable.php?id=004

https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2223164/address-of-amblewagon-in-troy-michigan.html