sorry for your problemsโฆ
I have often recommended the Kumho 195 to replace a 205 sized tire because it more closely matches the physical size of the OE tire and it unlike the Kumho 205 isnโt made in chinaโฆ and yes Kumho in china has had quality problems of major proportionsโฆ so much for the place of origin doesnโt matterโฆ
I have used the UE168 on a van (not a trailer) and wasnโt impressed with it but it didnโt fail eitherโฆ I have been impressed with the M8008 in my research for my own trailer tire replacementsโฆ the problem is I only researched the 225x75x15 with the mfg. themselves and has you now realize tires of the same brand may have different quality levels for different sizesโฆ
Based on my study in general and faced with your decision, without making a recommendation, I would be comfortable with and give the edge to the M8008โฆ
Love my mass produced, entry level, built by Lazy American Workers, Hornet