When I was trailer shopping, the biggest/heaviest car was my Buick (4,600#). I ended up buying an ATC trailer because of the light weight. Since I ordered it new, I did everything I could to keep the heft down. The result is a 1,500# enclosed trailer. With the Buick onboard, I'm just over 6,000#. This gave me more flexibility in choosing a tow vehicle. So as you shop, consider the budget for the entire package, not just the trailer. I preferred to put money in a lighter trailer instead of a heavier tow vehicle. When any other vehicle is in the trailer, it is way below my maximum capacity. After a few years with this setup, I bought a used Triton TC167 snowmobile trailer for my smaller cars. The ATC is like pulling a parachute which bothered me when I didn't need the capacity. The fit in the small trailer is snug, but it's really easy to tow and saves me a ton of time and money in fuel stops.
Edit: One point I should make is my pickup is a 3/4 ton. I bought is because it was a great low-mileage vehicle, not for the extra capacity.