I've done both hunts you're doing. For my dog hunts in my early (healthy, young years) I used a M29 and Colt Anaconda. Dog hunts can be brutal with massive walking. ID has lots of steep hills, so I'd suggest going light weight, but powerful. My 6" Anaconda was perfect. Something in .44 or .45/.454 would be perfect.
The gun choice on bait hunts should be determined by the distance shooting and terrain around the bait. If it's thick brush and longer distance a single shot big caliber gun would be better. If short distance and open woods a "tree gun" but with a red dot or scope like Mark said. My "bait hunts" over corn fields have been with a .375/.284 XP (AB & Lehigh Chaos) and .325 WSM XP (AB). The .375 bears never moved. I had a heck of a trailing with one .325 bear.
Your hunt should be a blast, being able to take 2 different guns for different situations.
Rockchucks will be fun if you can find any close to bear country. I've done over 50 a day several
times, a hundgunners dream. Shot so much the web of my hand bled!
Good luck. Have fun.