When I bought my Hearse in 2002, It was registered as a commercial truck.
I figured it was because of the registered capacity, ... 8500 pounds. She weighed 6554 pounds with a full tank of gas ( and without my fat butt in the seat ) so her hauling capacity was 1946 pounds ..... that's a lot of casket.
I re-registered here a a regular car no problems, but she "easily" handled our fully loaded trailer which was 14080 pounds.
( yea... we got some funny looks.)
Who says you can't take it with you ???