Re: Buick Le Sabre tow vehicle
Steven, I have both a 1998 and a 2004 LeSabre, both with hitches, both have been used quite frequently to tow a small popup and a small utility trailer, primarily for camping, sometimes for picking up mulch or lumber or such. I installed those hitches myself, it really was not hard to do if you have a drill and bits. (Well, the 04 was harder to wire)
Max allowable is 1000lbs, I'd say we've probably at most done 1200lbs with the popup and a lot of gear. Supension (both have FE3), motor, trans (I installed external aux coolers, also) handled that no problem; biggest issue I ever had was vapor lock in the 1998 underhood fuel lines while towing the popup on James Dean highway on a really hot summer day.
All that said, I'd hesitate to do 1600lbs on a public road, especially if there are any hills. And does that 1600lbs really include everything? (hull, motor, trailer, fuel, gear, etc.)
Also, have you gotten the hardened 4th (OD) clutch shaft update? If not, definitely keep it in 3rd while towing anything.
P.S., if you do decide to go ahead, LMK. I'm planning to sell the 98 soon and I am going to remove the hitch to sell separately. Where you located, anyway?