The 22-year-old Gilliland from Sherrills Ford, North Carolina, spent his final off-weekend period from the NASCAR Cup Series by celebrating a Truck Series victory at Knoxville, Iowa.
The 2018 Cup Series champion led 20 of 242 over-scheduled laps and prevailed in a late crossover battle with Kyle Busch to capture the inaugural Cup event in Madison, Illinois.
The 19-year-old Heim from Marietta, Georgia, prevailed over a late caution, a preferred lane choice and an overtime shootout to claim the first of three Triple Truck Challenge bonuses at Gateway.
The 22-year-old Smith from Huntington Beach, California, will be filling in for Buescher, who will not compete at Gateway following a positive COVID-19 test.
Ross Chastain capitalized through two overtime attempts and a late incident involving teammate Carson Hocevar and Ryan Preece to fend off the field and win the North Carolina Education Lottery 200 at Charlotte Motor Speedway on Friday, May 27.
The 22-year-old Smith from Huntington Beach, California, led a race-high 108 of 147 laps and executed an eight-lap dash to the finish for his third Truck victory of 2022.
The 24-year-old Byron from Charlotte, North Carolina, led 94 of 200 laps en route to his Truck Series victory in six years at the Paper Clip short track.
