v.1.3.9.1 - harvester fix

v.1.3.9 - sweeper & forklift fix

v.1.3.8 - experiments with tractor continues...

v.1.3.7 - tractor moved to "heavy trucks" (again) - non-semi trucks spawn so strangely in ETS2...

v.1.3.6 - tractor fix

v.1.3.5 - experimentally changed traffic category for tractor and forklift

v.1.3.4 - these spawn ratios should be much better (let me know what you think of them after playing)

v.1.3.3 - aaaaand I recalculated spawn ratios again

v.1.3.2 - slightly increased spawn ratios

v.1.3.1 - spawn ratios recalculated