A video marked "earlier today" showed Mark Henry pulling one semi-truck 20 feet outside of the arena (much like they do in strong-man competitions). Wrestlers that were visible cheering Henry included both Prime Time Players and Damien Sandow. They showed that later on, he would attempt another world record. However, clarification for that wss never given to the crowd at this point.
The video went back to the outside showing Mark Henry again, but this time it appeared live because it was dark outside. There are two semi-trucks behind him and Mark Striker announced that Henry will try to set a world record by pulling not one, but two semi-trucks at the same time. They stated this has never been attempted before and is the equivalent of pulling 110,000 lbs. (55 tons). Henry initially had trouble, and it became apparent that he was frustrated about it. Of note, the Prime Time Players and Sandow were still outside cheering him on as he attempted the record.
Striker asked Henry if he would give up and Henry snapped back that Striker doesn't believe he can do it, nor the people in the arena, either. He attempted again and the trucks began to move. They made it to the 20-foot mark and he collapsed. Wrestlers and paramedics (who appeared to be plants) checked to make sure he's okay. He got up and seemed okay at that point. Lilian Garcia then announced to the live crowd to congratulate Mark Henry for setting a world record.
We can say that Mark Henry is the strongest man on WWE. On Extreme Rules its going to be Mark Henry vs Sheamus on a strap match. The rule is to tie both opponents with a strap and the one who touches all four corners simultaneously wins. Will Sheamus find a way to beat the world's strongest man in his own game, we have to wait patiently to find out.