#29068 was first assigned by WBCCI in 1974, which is very appropriate for your 1974 31' Sovereign
. At that time, #29068 was assigned to Lowe and Marialyce Cannell of Indianapolis, IN. The Cannell's are last listed in the 1980 Directory, still in Indianapolis, IN. They are not listed as having participated on any numbered caravans. I spot checked a few later directories and it does not appear that #29068 was ever reassigned, or if it was it was only for a very few years between directories that I checked. That's all I can find on #29068. Enjoy your Sovereign!