If I thought there was a chance of taking a bear that big in a place I can't get a vehicle, I'd look into having some friends handy or arrange a horse. But, bear over 500 lbs live weight aren't common. That's why they end up in the paper when they are taken. So, I wouldn't get too hung up on it.

I've been involved in recovering several bear. To me, they seem harder to drag than deer or even elk because they don't have an antler or hoof to get ahold of. We drug a 7'1" black bear my father took about 1/4 mile to a place we could get a truck and it literally kicked our butts. That is why I like a pack frame if the law allows it.