A lot of good answers here. However, I think the best one is to do your own research and learn the "real" numbers for truck and trailer. When you look up the tow rating on a tow vehicle, pay attention to the small letters after the truck make and model. They refer to the motor, transmission, rearend gear ratio, etc. and the tow rating varies greatly depending on how the truck is equipped.. Beware what the dealers tell you...look up the numbers yourself. Also be aware that the tow ratings normally allow for a driver of 150 pounds and a full tank of gas and nothing else!! So, when you toss your lunch in, or anything else, you just used up some of that tow rating. Ram has a good guide on the tow rating part of their site with a slide bar. As you add a passenger or weight in the truck bed the tow rating comes down. Playing with that is an education in itself.
I went into a Ram dealer recently and there was a Ram with a sign stuck in the hitch receiver. The sign said "Tow 10,200 pounds with this truck." It failed to say "if you only weight 150 pounds, carry no passengers and the truck is completely empty!!" I looked at the window sticker and it did not list the rearend gear. If it is a 3.92 it will be listed! If not a 3.92 the stock gear is way higher and the tow rating is not over 8,800 pounds. As I was waiting for my truck to be serviced I told the dealer that I had $50 that says the tow rating on that truck was not over 8,800. He didn't take the bet and 20 minutes later the sign was removed. Don't trust what they tell you!!
That said,,,I had a 2003 Ram 1500 Quad cab, 5.7 Hemi with a 3.92 rearend (tow rating 7500 pounds). We pulled a TT with a max gross weight of 6500 pounds and normally were on the road at around 5700 pounds. This handled the mountains great and it was obvious we could handle a heavier load. We traded the truck for a 2012 Ram 1500 Quad Cab, 3.92 rearend with a 10,200 pound tow rating. More horse power and torque on this Ram AND better gas mileage. We bought a TT that is 5,060 empty and has a max gross of 10,000 pounds. We are normally on the road at 7,700 pounds or less. Pulls like a dream and handles the mountains great!! There is no doubt that a 2500 and a diesel would do better but why pay the extra bucks to buy it, the gas, the insurance, maintenance, etc. when you don't need it. When we park the trailer at our winter site I have a truck that rides like a car.
I would not have any reasonable sized TT with out a good load distribution hitch with built in anti-sway or add on anti-sway device. Now, all that said. I found the the newer Rams with the front and back coil springs are a little soft sprung in the back. I added a set of Airlift 1,000 air bags that I picked up new for $88 and installed them myself (no drilling). What a fantastic improvement for the Ram!!
Happy with the 1/2 ton Ram towing 7,700 pounds.