AUBURN – The 53-foot-long trailer cruising down Route 4 Tuesday pulled into Wallingford Equipment around 10 a.m.

It won’t be there for long.

Starting this weekend, the trailer, designed by United Sports in Turner and built by SNOPRO in Winslow, will carry the Wallingford Racing team around the Northeast as it competes in the Rock Maple Snocross Series.

“They’ll be scrambling, but they’ll pull it off,” said Phil Whipple, public relations director for Rock Maple Racing as the Wallingford team outfits its new home. The first race of the season kicks off Dec. 1 at Whaleback Mountain in Enfield, N.H.

Snocross, the wintry version of motocross where souped up snowmobiles fly around special tracks, often thrilling fans with airborne tricks, is growing. Black Mountain in Rumford will host its first event Dec. 15, when 300 teams are expected to compete.

One of those teams will be Mark Wallingford’s, owner of the heavy equipment store and Ski-Doo dealership on Center Street. Wallingford’s team will be racing for Arctic Cat, the snowmobile manufacturer that dominates snocross competitions in other parts of the country and has New England in its sights. Wallingford also will provide regional technical support for any Arctic Cat racers in the series.

“They were the dominant brand here five or six years ago,” Wallingford said. “Now they’re the least dominant brand. We’re going to get them back on the map for racing.”

In his corner is a team of four riders and crew of technicians and mechanics, as well as the custom-built trailer. The almost 8-ton aluminum unit combines living space (bunks, kitchen, living room, bathroom), a workshop and garage (an interior hydraulic lift can stack and store up to 10 racing sleds).

“It took months to design because it’s so intricate,” said Jonny Wakefield, operations manager at United Sports. “It’s all custom, from the ground up.”

The enclosed trailer took nearly five weeks to build at SNOPRO. The company is gearing up for more specialty trailers for racing and high performance sleds, said owner Bill Cleaves. Next up: a custom trailer for Jimmy “Blaze” Fejes, an extreme sled driver who holds the record for the longest backflip on a snowmobile (102 feet).

“We’re building it with a landing ramp on the roof,” Cleaves said. “It’s quite a project.”

The specialty trailer for Wallingford would sell in the ballpark of $150,000 if it were being offered retail, Cleaves said. SNOPRO, United Sports and Arctic Cat are co-sponsoring the Auburn team.

“All of these Maine companies are coming together to help each other,” Wakefield said.

Wallingford said his team had raced Ski-Doos in previous seasons, but Arctic Cat was willing to invest more in the team. The manufacturer already delivered nine specially modified sleds, each which can hit 60 mph, change directions quickly and routinely handle 60-foot jumps.

“This is a physically demanding sport,” Whipple said. “Mark has some eager and talented young riders.”

He said snocross is growing in New England, where the host site for a race can typically expect a $500,000 boost to the local economy from the teams and their fans. Rock Maple also races in Skowhegan.

The Midwest has been the hub of snocross racing, but New England is coming on strong, Whipple said. This year, racers will have electronic transponders to record their times for the first time.

“We’re taking it to the next level,” he said.