Clear chains vertically, but if you're driving a 4runner or an FJ, you might still make contact with brake lines. I only run front chains on my FJ when I'm stuck to the point of camping out and waiting for help.
My experience with Sportspal's is that they get way more unstable with a high center of gravity than a comparable Old Town. If you keep the weight of the blind low or add some outriggers you should be fine, but take it out and try some broadside shots just to see how tippy it is. My buddy and I...