I highly doubt it was the truck, as by the time the camera would wake up from it and the truck traveling at"X" mph, I doubt it would have gotten its pic taken that close to the very beginning edge of the pic's
I would say the wind blowing a leave fell or something else triggered the cam and well got lucky and caught the truck in it at same time
I am sure lots of trucks and or like vehicles drive down the road now and then and if they were tripping the camera's sensor, you would have lots of like pic's!
just my 2 cents here!