The trucks with 5 gears do not have a hi and low option Is the 5th gear an extra low gear? or is it an extra high gear or is it dependent upon the truck? The trucks with 4 gears have a hi and low option Generally if the 5th gear is a high gear a 5 gear truck would be best for the city roads/highways? Generally if the truck has 4 gears with hi/low the truck would not quite be as good on a highway but MUCH better in the off road? Am I correct in making these assumptions or does it work a little differently?