I've picked up a dual wheel ratchet jockey wheel to be able to move the trailer into its pen on my own. The setup itself works ok but the problem is that the clamp can't take to torque of ratcheting action and eventually the upright moves about 40 degrees from vertical.

I'm thinking this may help http://www.ebay.com.au/itm/1x-Double-Clamp-Fixing-Brackets-Weld-On-To-Suit-Std-48mm-Tube-Jockey-Wheel-/121076014940?pt=AU_product_Trailer_Parts&hash=item1c30b15f5c but before buying/welding I wanted to see if anyone else has any suggestions.

The clamp on it currently is one of the two clamps on the ebay link.