Well considering this car had basically the same engine and trans, you can pull a trailer. This Buick was a work work horse. I drove that thing on road when I was a service tech. it made many trips from Mich out the east coast and Tinker Air Force Base. Then for the lab in California I made the trip twice from Michigan pulling this trailer with two gasifiers systems. SOooo I had not only the car overloaded but also the trailer at twice its capacity!!! lol. Yeah had to go over the Rockys both ways twice in the summer heat!!
That car was a beast!
Im sure it said the same thing in my manual. The reason I know these cars so well, is I did tons of Transmission RnR’s Odds are the trans in your was replaced at some point in its life. These late 80’s to mid 90’s cars had bad transmissions. Not just GM all of them. Ford and Chrysler too. I had them down. especially the Ford Torus, I could lay out every tool in sequence on my box and do the complete RnR in under 4 hours!!
So with that said check the fluid and maybe add a trans cooler in your build budget.
I cant remember how I did my hitch but it was very custom, Not much under there to attach it too. But you should be able to build a small rease style hitch to tug a gasifier around.