fSlipstreamDistanceFactor:
higher values make tow stronger even at greater distances, lower values make the tow less effective at greater distances.
fSlipstreamSideDistanceFactor:
max lateral distance with tow effects
fSlipstreamFactor:
it multiplies the default tow force. Eligible values are greater than 0, default is 1.
fSlipstreamMaxDistance:
max back distance with tow effects