Good Buddy

P wants to show that the load in the back of a truck shifted when the truck going 30 mph hit a bump in the road. W is offered to testify that he is a trucker who often drives the type of truck in question, that he drove over the bump at 30 mph, and that the bump was big enough to cause a load to shift. Is his testimony admissible? How should the judge decide whether to rule under 701 or 702? Does it matter?