In my experience, Kurt Kinetic or a used Cyclops with a fluid or a progressive mag unit would be good. Those tend to have ~2" drums, which work a bit better than the tiny 1" drums on a typical cheapo mag trainer. They also tend to have a heavier flywheel, which is nice. Under $350 new, less if you get used. But anything with a smaller than a 6" diameter roller or drum will eat tires, so you'll probably want a dedicated rear wheel for this, unless you don't plan to ride outside during the same time of year as your heavy trainer use, which will tend to flatten and glaze the tire.
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