Search:

If you take trailer to Briford, get Brian to weld plate & supply plunger coupling. No need for u bolts.

Sent from my SM-S906E using Tapatalk

As MD said, get 4 hole plate welded on top but use wider pattern to allow for bolts to pass beam. Standard Trojan will be too narrow.
No option for heavy duty version of what you have. Incidently,...