I towed with 1/4 ton truck, 1/2 ton and 3/4ton trucks and its all the same as far as braking, my 1/4 ton truck and 6K trailer had the best braking of them all and I traded up because I had tires turning on the rims at 35psi pressure. When I applied the brakes hard the weight of the trailer coming down on the rear prevented the tires to slip and the brakes were so good that the rims turned on the tires. The 1/2 ton GM spring carried the small trailer well but the rear suspension felt to soft for the 500Lbs pin weight of the 5th wheel. Then I trade up to a 3/4 ton with 2000 lbs pin weight trailer and the new diesel drove like a cadilac with trailer hooked up.
I would not put more then 700-900 lbs pin weight on any 1/2 ton, because looking at the wimpy springs the ride will be bouncy, depending on the shocks to hold the trailer weight and air bags DO NOT HELP THE RIDE.
In our province of NB Canada, I see all the Sundance trailer pulled with 1/2 tons and they seam to give satisfactory rides, it could be the design like my BC which is fantastic to tow, but it scares me that so many 1/2 tons are pullinfg these 33ft long Sundance trailers that weight as much as my previous 5th wheel. When I hitched the previous 33ft unit on the 1/2 ton the rear tires went so far down that I knew the ride was going to be awfull. My experience with it was that the 50 lbs in the rear tire was never enough to carry or provide the braking for the Sundance trailers, I say that due to my experience with the 1/4 ton truck with 35psi rear tires and rims.
I have a friend with a F450 pulling a 16000lbs trailer with 35psi air in the rear tire because the truck is way to rough, so my theory applies for all trucks, the air capacity providing tire to wheel grip has to be accounted for.