I have an old steel rim with about a million spokes that weighs a ton and I use all of my old tires on that until they really wear away. The pressure on the cassette (and frame) is pretty high on a trainer so just have an old crappy wheel and tire combo with a compatible cassette that you can flip on for the trainer and off when out on the road. If you use a trainer enough eventually all your tires will wear flat like that, so it makes sense to use something that will wear out and you wont mind.