Unless these downed trees are absolute monsters, I don't think you'll have any issues at all pulling the logs out with a 474 sized chassis.
I think traction will be you're limiting factor here, not tractor chassis size.
I've pulled some pretty hard pulls with my 25 series, 4200 lb bare chassis, 7100 lbs all dressed up for the party. Keep it in 4wd and low range if you're pulling on monsters and worried about it. You can always cut the logs shorter if they're massive.
No where in this thread have you mentioned how big the actual logs will be. That is key information. How big? What species of tree? There are lumber weight charts that will give you a good estimate of how much actual weight you're dealing with.