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Your load doesn't increase. Example, if a truck weighs 10tn sitting on flat ground it still weighs 10tn when you pick it straight up 90deg. If you've factored 1/7th veh weight for rolling resistance on flat grass then yes you will need to add in .50% for a 30deg grade increase... Or you could...

I hope that answered your tackle block question. Kind'a got side tracked. 8) Slope or uphill pull shouldn't have any effect on calculations, just like water. Mire factor(how deep the truck is stuck in the slop) friction is the only load increasing factor. TLR will decrease if it's a rolling...

Don't forget your tackle resistance which is 10% of your load resistance (veh. weight +cargo weight X mire factor - reduction factor) X # number of sheaves (1 less than # of mechanical advantage) which will finally give you your total load resistance. I used to do alot of 1-1 pulls when I used...

Don't forget to check out FM 20-22 up in the TM section. It'll answer alot of recovery/winch questions.