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Trucks Accelerate Downhill Physics Fix

This mod corrects physics issues that cause trucks to not gain speed as they roll down hill.
Even on steep grades with heavy loads, you have to apply throttle to not loose speed- that's just completely wrong.

Specifically this mod does the following:

• Removes excessive air resistance, that was acting like towing a parachute.
  
• Reduces transmission viscosity, essentially replacing the honey with transmission fluid.
  
• Puts air in the tires so they roll easier, they were practically flat.
  
• Reduces passive engine braking by 80%!

With this mod, heavy trucks will gain 5-10 MPH going down moderate hills around towns, which is perfectly realistic. If you put your truck up on top of a mountain and let it roll, it will rapidly gain speed until you either crash or get to the bottom going 100+ MPH.


--- Developer Comment --

This is the best downhill driving experience I can create, without the help of SCS. When you rev the engine, the game applies a whopping 298 Nm (220 ft-lb) resistive force to bring a 14.9L engine back down to idle! This resistive force also prevents trucks from rolling down hill without holding down the throttle. When I reduce the resistive force, RPMs don't come down, unless I also reduce the engine inertia to that of a car engine. Unfortunately, the quick revving in neutral is a work around that is necessary to let the trucks roll freely downhill.

The best fix would be for SCS to add a simple piece of logic to scale the resistive force down to 55 Nm (45 ft-lb), an 80% reduction, when the transmission is not in neutral and the clutch is engaged (if manual). That would perfectly simulate coasting downhill and eliminate the need for this mod.