I seem to recall doing much the same in Bedford 3 tonners, but using a fair bit of steering lock, then a LOT of power to spin it round, but only in the early morning when setting up the launch site. As Staff Cadet, I was frequently the only one there at that time of the morning. The marks in the grass were nothing compared to the ruts that a Beverley made when picking up the RAF Falcons on a Battle of Britain day show.! I swear that they were still there a year later, but it did mean getting a Mk111 airborne was made easier, if a little premature!!. Happy days!.