Never seen or trapped one, but I'd try some cages (might have to be custom sized) with good cover over them. From what I've read/heard about rock chucks their burrows are up to 25 feet deep and are usually located under rocks.
For bait i'd try some flowers, seeds, or maybe fruit?
I read they hibernate from September to May so coming up here pretty soon seems like an ideal time to catch them waking up looking for an easy meal....My

Good luck
