It's a product of its times, it screams 80s from the very beginning.
The story follows Lincoln Hawk, a truck driver who wants to reconnect with his 12 years old son after abandoning him and his mother before he was born. But when mommy is on the verge of death because of some unclear heart disesase, the evil and filthy rich grandfather pretends full custody of the nephew... after raising him since he was a newborn! Can you believe the audacity??
Also, Lincoln is such a great father figure! He teaches his 12 years old son to drive a truck in a freeway (so later the son manages to steal a car and drive to the airport to see his daddy's arm wrestling tournament in another city, what a nice and not dangerous thing to do!); he goes to a teen bully to challenge him in arm wrestling match with his son, in fact OBLIGING his son who didn't want to do it and was scared shit of losing an arm or something (but come on, who wouldn't want their dad going to the to the big strong bully to tell him "HEY, MY SON CAN BEAT THE SHIT OUT OF YOU!! HERE'S 5 BUCKS, FIGHT HIM!!"; I mean, it's fundemental to learn a life lesson!); he basically lose full custody when he crashes into the grandfather's villa, destroying the gate and threating to kidnap his son... what a clever move and what a non-threatening dad! Definitely not scary at all!
Oh, but don't worry, because granpa changes his mind when he sees Lincoln fighting in the final arm wrestling competition. Since he has proven he is the toughest man around, he can have the kid!
Such a happy ending!