I have a 2007 suburban 5.3l and towed a 2008 Passport 29BH which is the same floor plan as those you have listed with a dry weight of 5000lb. I towed that trailer for 3 years and have been towing my current KZ 265KS at 5100lb dry for the last 3 years and have had no issues. I keep it at 60mph on the back roads and 65mph on the interstates and no problems over the hills in KY & TN. You will bog down on the big hills but that should be expected. If you have the correct WD hitch and don't push it too hard you should be OK with a 5000lb TT. That's my experience.
