I have a similar truck with a 1500 lbs payload.. 3:42 rear.. ( And yes a 4 speed... tow in 3rd)
Just throwing this out there for ya. You can make your own decision.
My travel trailer 4700 lbs from factory. Hitch weight 550 advertised.
Well after loading basic stuff, another battery and full propane hitch weight went to 750 and trailer about 5300 lbs.
Thats without food and clothes ready to camp in the camper.
Then comes the truck. Yes 4 passengers but I put stuff in the bed.
Ill tell you this.. I am maxed out if not over. I would not want to tow more with that 5.3. I put large trans cooler to help keep trans cool.
Ill have to check the two units your looking at..
Also a note I have 1000 lb bar wd hitch and have max washers and can restore to 150 lbs or so front axle. I cant get any better unless I stress the chains bars frame or truck and trailer.
Also long bed. I went with sumo springs in rear for sag...
