If the belts and pulleys are correct and in good shape they should bite hard before slip. Most 1 ton's with central hydralics are run from dual belts. Lots of boats also run that system for hydraulic power. I had lots of trouble with my boat and it turned out the pulleys on the crank were aluminum and had worn to the point where the belts bottomed out instead of riding on the sides as they are supposed to. I had a machine shop turn out a steel one.
89 dodge 3/4 4x4, A727 ,3.07 gears, factory L S , powerstroke intercooler, S300, stans exaust with stainless tailpipe, fuel power screw turned?, fuel pin turned to deepest, 3 turns smoke screw, 1/2 turn down on starwheel.
93 W250 ex cab, 6X16's, 60 GDS, rag