They suck for what you want to do. You are right, the hard part is breaking trail and your not floating anywhere but straight down in deep snow. It's going to cost a lot, before and after the repairs. Get a giant warn winch, extra battery system and few friends to go with you each day, bring lots of food and water. Your going to need a group of people on stand by, so you can call for rescue. They must have a front end loader and heavy chains. They have to drag your machine out. That's going to do a lot of damage in itself.

If you can get it turned around in your tracks, get back to the trailer and don't come back. The locals will not be happy to see what you did to the trails or roads. If it breaks down on the trail overnight, they will light it on fire and put the fire out with bullets. Welcome to Alaska. Lessons are not free.

Get a beater sno-go and go have some fun trapping instead of the pain and money your going to spend driving around in a heated baby crib doing everything but trapping.

martentrapper and bearcat2's points are correct as well.

Your last statement is incorrect. You should be worried about the rest. It's not worth it. Good luck, hope it works out, listen to the locals if nothing else.

I know quite a few people running tracks who haven't had to replace any ball joints, tie rods, or bearings. All in how you use them. That being said, to a man they all say the same thing, keep them off of sloped or slanted trails or roads. Side to side traction is poor with them. Going straight up or down something they are fine, it's the off camber stuff that gets them in trouble. The gear reduction from running tracks means you burn a lot more fuel, and you go a lot slower. A snowmobile will run off and leave anything on tracks. If you're looking for a dedicated trapping sled get a widetrack. If it's going to be a dual use machine get a standard width track, just know they'll be limitations on how much you can haul on one of them.