if we were talking about a motorhome towing a vehicle you'd be on the right track. in addition to the GVWR a motorhome has a GCWR...gross combination weight rating. that's the total weight the MH can propel including itself. discounting tow bar and hitch weight ratings in general for every pound the MH weighs less than the GVWR a pound is added to the GCWR. in the real world its a bit more complex but that's the general idea.
i don’t believe passenger car towing works the same way. the tranny, gear ratios and so on are engineered to tow a set weight and i’ve never seen a GCWR on a pass car, just a max tow weight. i could be wrong about this and if so someone will set me straight.
that being said...how far are you towing? flat or hilly? a buddy once towed a 45’ trailer with his 6-cyl PU from chicago to his seasonal site in northern WI. i thought he was crazy but he made it. i wouldn’t have done that but like Indiana Jones said...”Never tell me the odds”.
