Trailer rim vs Automobile rim?

[cj847]

I have been struggling with this for a while. I understand that trailer tires are different from vehicle tires (vertical loading, sidewall flex, etc), that all makes sense. However, I can't find information on the difference between a trailer rim and a car rim. The only thing I've found is that trailer wheels generally have zero offset (just like our trucks). Also, they have giant center hole, so I assume they are lug centric.

Does anyone actually know the difference and good engineering reason not to run them on our trucks? I get they are "engineered" for vertical loads vs side loads, but unless there is a difference in metal alloy or weld quality, I'm having a hard time understanding what is different. My guess is they are manufactured side by side with car rims in whatever factory is making them.

PS> Based on the history of nascar (the main failure was wheel rims) any rim made before about 1960 should be outlawed. I am almost certain a new trailer rim is safer than any 1948 chevy rim.

Rant off