PROB. ISN T A SUM YOU WILL HAVE 2 DO BUT ?MOST MODERN PAVEMENTS HAVE A MAX LOAD OF 3AND A HALF TON AS I REMEMBER FROM MY CONSTRUCTION / PLANT OP DAYS , ALSO (PERHAPS AN OBVIOUS ONE?) TRY 2 AVOID LEG BEING ADJACENT TO A GULLY, AS THE CAN AND DO CAVE IN/COLLAPSE ! ITS ALWAYS SODS LAW THAT 100 TRUCKS HAVE SUCCESSFULLY DROPPED JUST AT THAT SPOT, !!! UNTIL , YEP YOU/ME TRIES 2 !!