doghead

I have been using winch shear pins that i bought from Saturn Surplus. I seem to shear them pretty easily. My question is, should I be able to winch the truck forward if the object I am hooked to does not move with the brakes depressed to the point that all wheels skid? (level sandy ground ,engine 800 rpm) When I first got the truck, it had a grade 5 bolt in it. I was able to shear that and a few more when i had not read the tech manual and chained the truck to a large tree and tried to winch something very heavy and the truck was facing a 30 foot drop-off. When I realized that it uses an aluminum pin, I promptly ordered some and have been using them. I can tell you that when the bolts sheared, there was a light "snap" noticed. With the aluminum pins, I feel nothing. The only indication of it shearing is the fact that nothing is moving. I really would like to think that the winch is capable of "dead dragging" the deuce with all wheels locked. For me this has not been the case. I do realize there are capacity increasing options such as doubling with a pulley and less cable on the spool. In any case I just want to know if you guys have had better success than me when it comes to Heavy winching with your trucks. Is everyone here using the aluminum shear pins?

M819
M35A2 w/w
M35A2
M109
M561 w/w
M274
M1008A1
M38A1
M105
Pioneer tool trailer
M116A2
MEP-002