For more than two decades, industrial design firm Infusion Design has grown accustomed to working on some of the largest projects out there, custom outfitting things like “super yachts” and 777 wide-body jets. Now Infusion is expanding into the opposite end of the spectrum with its latest offering, a compact sport trailer designed for off-roading adventure. Sean Elsner, owner and president of the Bonner Springs, Kan., company, said Infusion’s trailer…