Recently revived old thread(Thank you josquared) notes that they appear to have reopened near 6 Flags in Vallejo. It appears they are the same folks who make the great hot links I liked and which disappeared. Definitely will try on my next north bay swing along with Dillon Bread Co. Link to links.
Pipkin's Pit BBQ & Lady Nisee's
1624 Fairgrounds Dr, Vallejo, CA 94589
Dillon Bread Co
451 Ryder St, Vallejo, CA 94590