ASICS - GEL-FujiAttack 5

The GDT is hard on shoes but that's a *really* short life.  For reference I have worn Asics Fuji Attack trail runners - basically an unknown and unhyped model of trail runner - on both of my GDT thrus and they lasted to Field. They showed wear in Boulton Creek (mile 210) and needed minor repair then lasted until Field (mile 336) before needing replacement. Then the replacement lasted the rest of the GDT from there. Your Topos lasted half as long as my random pair of Asics. That's terrible.

I've thru hiked the GDT twice. You should be able to get to at least Field before you need a replacement. Then the replacement lasts until Kakwa. This is discussed all the time in the community.  It's not an exception. There aren't a lot of opportunities to get replacement gear on the GDT and it would be the exception to ship a new pair of trail runners at nearly every resupply.

I've done it, but... My Asics marathon shoes were Novablast 3s. They aren't grippy enough on wet trails. If the trail is dry and rough, your fine. Otherwise I'll reconsider. Don't do it on wet muddy trails. In warm dry conditions, go for it. I've found out that shoes that will let you run a marathon without problems are also great for some trail walking, even with some light (max 10 kg) backpack. Just watch your ankles if your not used to trails. Note: I also did it on my Asics Fuji trail runners and they are way more capable in terms of grip. They're also a bit more sturdy which made it perfect for long distance walking for me. If you have the option, trail runners are the way to go. Note 2: I've got myself a pair of Lowa Maddox Pro mid now, because of grip and slight ankle support. They still feel much like trail runners, so for me it's the right entry point into boots without overdoing it. If you were to start boots, don't immediately go all out Salomon Quest or other heavy ones.

Appreciate the Altra Olympus 6 rec! And I definitely plan to try any of these on, just trying to start with a long list -- haven't hiked enough in trail runners yet to know my preferences. I know that Asics trail running shoes feel great even on 20+ mile days for me, but I find that they wear out quite quickly and imagine this might be why I see them recommended less on here.