I see two that require welding... do you know the model #?

 

Part number 69779.

 

That's the one I have on my 5X8 utility trailer I tow an ATV with. Easy to install and works great. I think the only trouble I had is that I had to use shorter bolts to mount it because the shoulder on the supplied bolts was longer than the thickness of my trailer tongue, so the nuts bottomed out on it.