towing trailer tow

Hi All, I've just put the first tow on my 1991 Roadmaster Estate Wagon (w/~150k miles, never used to tow before) pulling a 6x14x6 1/2' tall enclosed trailer (aluminum frame, ~1600# empty). I had fixed a bunch of maintenance things and had a trans cooler installed. I had a class III/IV receiver...

First of all, yes, I know the owners manual says "no towing". :sad: I installed a tow hitch on my 2013 Encore so I could use a hitch mounted bike rack. Ill be moving soon and thought about renting a small u-haul trailer. The entire drive is relatively flat - no mountains involved. I was...