"It hasn't been a financial burden for any one person," Barbagallo said. "If we need something, everybody will pitch in."
Before each season, Bosley and Barbagallo collect dues from the regular tailgaters, typically about $400.
That pays for maintenance and upgrades to the bus and tailgating supplies.
Bosley noted that some of the dues are used to keep the bus in storage until it's time to bring it out for Ravens games or as unique transportation to a prom.
The bus will make its next appearance at this spring's senior prom at Catonsville High School.
After Sunday's tailgate, Bosley, his wife, Julie, Barbagallo and his wife, Katie, spent three hours on Monday morning cleaning the bus, Bosley said.
"It looked like a tornado went through it, like an 'Animal House' frat party," Jack said.
While they cleaned, Katie said, the guys floated some ideas about how to improve the bus.
Last year, they installed a 32-inch flat-screen television to the bus.
Unfortunately, there was no generator to power it. The day of a game, Bob recalled, they called tailgater Billy Cook and asked him to bring a generator.
He did, the regulars divvied up the cost and they had their television.
"We're all just chipping in together. It's just a lot of fun," Jack said.
"We choose to drive this bus and put it in a parking lot, when we could be in our nice houses," he said with a laugh.
It's not as if the group roughs it while sitting outside of M&T Bank Stadium.
In addition to food and television, the bus has a portable bathroom, Jack said, so they can avoid waiting in line.
Jack, Bob and the rest of the gang admit they couldn't have done it without the support of their understanding wives.
Jack said Julie, also a huge Ravens and tailgating fan, supported the decision to buy the bus and never complained as the purple vehicle sat in their driveway for two years.
Katie said the wives supported the idea and even helped to customize the bus by making the tops for the benches.
"It's typical with this group of guys," Katie said. "They get these ideas that we think are ridiculous and ludicrous and they make it work."
"We take our tailgates seriously in that we like to be there by 9 a.m.," Katie added. "You get to know everybody around you and everyone invites their friends. It's a wonderful party."
With the Ravens playing in New England next week, the Barbagallos and Bosleys will go to a friend's house to watch the game.
Jack said he is "cautiously optimistic" that the Ravens will pull out another victory against the Patriots.
Bob was more confident, predicting the Ravens would win a close contest.
But win or lose, the group is already thinking about the future.
"We'll get revved up for next season," Bob said about the bus.