I have a set of 35 12.5 SSR's on my 79 F150, and I love them. They run quieter than the Wild Countries I had on there, and they seem to be wearing good, the truck is not a daily driver anymore though, but it was for a few years. They work awesome in snow and on ice, I never even have to use 4 wheel drive on the road, even through the New England winters here. The only thing I would caution you on is to look at the actual size of the tire (swamper publishes this data), because the TSL series you are use to, I believe a 35 actually measures 35.9" and with the SSR they measure closer to a true 35" tire, or something to that effect, just double check before you actually decide on a size.

Sean