how to figure force for testing welds

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i made a motorcycle carrier to hang off the back of my truckit's a piece of 6" channel steel with a 45 welded on the front for the front tire to sit againsti figure the force on this weld is the force of the tie downswhich is maybe 150 ft. lbs. with my measly musclesplus the force of gravity times the 200 lb. biketimes 4 or 5 which is the hardest bump i'll ever hit with the bike on backso if i merely turn the rail upside down and drive up on it with one truck tirethat is not enuf weight to test the force this weld may seei'm thinkingor are my equations way off ?
Reply:It's hard to really say without a photo, one has to account for moment as well as whatever force multiplication occurs any time the part is accelerated or decelerated with a load on it (i.e. driving over bumps).  There will also be some torsional load as well if I'm imagining what you're describing.In any case, if you can drive over the part with your truck without it failing, it'll probably be fine.