I've never owned or seen these type wheels in person. Are the wheel centers stitch welded or solid bead of weld to the outer wheel?

I'd like to use these type wheels on my car trailer but have read several articles about car wheels not being "strong enough" for trailer wheels - and the most common comment I've seen about the lack of strength in car wheels is the stitch welding.

Any comments, experiences or opinions welcomed!!

Thanks all!