We are a party of 6 traveling from Bordeaux to Avignon. We will be traveling in March and the schedule shows a 6 minute transfer time between our train from Bordeaux and the one leaving for Avignon. Is this doable with luggage?
Arles is a small station but that transfer requires your group to be organized and hop off immediately with luggage in hand. The regional train may or may not wait if your long-distance train arrives late. The next departures from Arles to Avignon after 16:01 are usually a bus/train combo, then a bus, then a reserved TGV, then at 18:01 another regional train of the same type as you're planning to take. Your regional train ticket would not be valid on the more expensive TGV.
Google Maps provides these photos. They show that there are only a few platforms, and maybe an underground passage, to deal with.
As I remember it is a very small station. The train arrived, we got off, and someone was waving us over to another track with a waiting train. We got on and we off. My guess is that the regional will wait a few minutes. If an half hour or more later then probably not. A lot of people made that transfer that day.