Posted by Jerry/MT on January 09, 2009 at 16:16:13 from (206.183.116.129):
In Reply to: D rings posted by Plumcrazy on December 22, 2008 at 04:39:43:
Those rings are only as good as what you attach them to and what you attach them with.
Unless you're going to hang your tractor up on them, the main loads that they will see is the the tension you put on them with chain binders, the fraction of weight that they pick up whe you go up and down hill and the acceleration and deceleration loads plus any manuever loads that are imposed especially in an emergency situation. Without doing a detailed structural analysis, it's hard to know whether your existing trailer is capable enough as is to handle the loads.
Maneuver loads are probably the largest and also the hardest to figure. If you bolt them on, use large (1/2 "?)grade 8 bolts and make sure that what you bolt them too is really beefy and watch th edge margins on the holes. If you weld it, weld it on to heavy structure, reinforcing it if necessary. If you don't know what you are doing have a professional welder make the modification for you. He'll most likely over build it but that's OK. It ain't the Space Shuttle.
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