In a scenario which includes a semi and dry van trailer (such as Heavy Delivery Pack:Utah's "Heavy Cargo B" scenario) the landing gear can malfunction upon scenario reset. If the landing gear is in the up position (such as when it is attached to the semi) and the scenario is reset, the landing gear will remain in the "up" position with no way for the player to correct it. For this reason it can be difficult or impossible to hookup to the trailer after a reset (The front of the trailer is too low to get the fifth wheel under it.). I've attached a screenshot. This is very easy to replicate, please let me know if there are any questions. For now, a workaround is to be certain to press "L" to disconnect the trailer before resetting the scenario.