Ok, those last pictures are a little better angle, I see what you're talking about. Yeah, I haven't had that before where worn tread (presumably scuffed) is hanging over the tread blocks. If I had to guess I'd say your wheels are towed in too much and they're scuffing as you drive down the road. Or, the Caster is off (spindle tilted too far forward or backward) and when you turn sharp (parking lot), your alignment is binding and the inner wheel (when making a turn) is turned in too far (pulling the rubber outward to the edge of the tire). When you visually look at the front wheels do they look out of alignment at all? What about when you turn them sharp? Does it feel like it's binding when you turn sharp?
Thing about the H3 is setting the toe is a compromise. At static ride height, the tie rods are at ~15 degree angle (downward). So when you hit a bump and the body goes down, the tie rods become more parallel and it causes toe-out ...the tires actually splay outward! This happens under braking too. Way moreso than most vehicles where the tie rods are typically parallel to the ground. The reason the H3 is this way is for greater wheel articulation, esp off-road. So what a shop has to do when setting alignment is shoot for the middle ground when setting the toe: Good down the highway but not too far toed-in, and not too far out (won't wear the insides of the tire) when braking and the body dips down. Breaking puts a lot of wear on tires. In addition, if your H3's alignment & toe was good BEFORE, and you or someone raised the front end up on their H3 to add some clearance, that would increase the angle of the tie-rods and pull the front of it's tires inward (increase the toe-in). That could cause the scuffing that is shown in your pictures. Anyway, w/o being there, it's hard to know for sure. That's my keyboard assessment of what might be going on. Take a look at your H3's tie rods and you'll see what I mean.
If you're a DIY guy, you can adjust your H3's toe-in easily yourself. I've adjusted and tweaked my H3's toe-in many times. Only takes a few minutes. Use a tape measure across "like" treadblocks on the front, and at the rear of the tire. Make sure your H3's steering is straight and vehicle is on the ground (can't set toe on jackstands). Rock it forward & back a little (roll it by pushing) to take any preload out of your wheels/steering ..before you begin. You don't "Need" toe plates to do the job. Just do it on level ground. Sure toe plates would be nice, but so would a hoist, $20k of Snap-on tools and a pile of gold bars ..lol. I set mine to a schootch over 3/16ths ...maybe like 5/32nds, difference front-to-rear. That's with a 285 tire. Remember # that gets divided by two ...so the actual 'toe-in' at the front is half of what your front-to-rear differrence is. Hope that's not confusing. Using a tape measure sounds crude, but some dealers actually do it that way to set a quick toe. I've seen them do it. Me and a buddy had pit passes at an Indycar race (in Milwaukee) years ago, and I personally witnessed pit crews setting the toe on a race car literally 8' in front of me! Yeah, with a tape measure. So if it's good enough for an indy car that goes 200mph, it ought to be good for my lumbering H3 LOL. There's videos how to do it. Make sure all your suspension is in good condition.
Like I say, inspect all the components (or have them check it) before you take it in. And if you take it to a shop, replace what needs to be replacing first. Or if you DO take it to a shop, I'd ask them in advance, if they'll install parts you buy ...and YOU pre-buy all AC Delco parts (as needed). At least then you know what's on there. Explain to them you can't just go to any old parts store nowadays and get parts (or at least goog MOOG or GM parts). I'd be careful what alignment shop you choose. One which has an old-school alignment guy who's finicky as he// is the one I would choose. A chain alignment shop ...I just haven't had good luck with them. Some of those guys are young & just apes with tools or not picky enough. I'd personally replace anything that needs replacing myself prior to taking to an alignment shop. And I'd watch them the whole time they were doing the work.
Good luck. Hope it helps. Sorry for the long response.
