Camper jack torn off driving

I noticed that the camper is build out of finger jointed wood on that corner. It appears that there were three lags holding the jack from the side and three from the front. A section ow the structural wood is ripped out and needs replaced. I would use wood knives and cleanup the remaining wood and get it smooth and level and shape another piece of wood to replace what is missing. Test fit it while dry. Once it is correct sized and fits without voids go to HD and get their strongest wood glue and dab it all around into the side and then press the piece of wood that has been shaped to fit into place and secure it with a couple deck screws and allow to completely cure.

Next I would begin to replace the jack using wood to metal adhesive as well as lag bolt it from the side and the front.

Then work the remaining damage to repair the cosmetic appearance.