trucks getting stuck on woodbridge

i just had a small session in alaska on the mission 'nothing to waste' or what it's called, where you have to tow a truck to the mansion on the hill. first i got stuck with the chevy pickup truck, but was able to tow and wind myself free, then the truck-to-be towed got stuck at the same point. both times the front wheels slipped through the bridge and nothing was to be done about it...i guess i'll have to restart the mission and lose valuable time.

here is a screenshot of it
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Had the same thing in the exact same mission and place towing the old truck with a Hummer 2! The front axle of the Hummer fell through the bridge. I hoped this error was erased in patch 5.1.