Welcome to the forum.
Well when you make it to the mainland side, make sure and stop off at Puerto Penasco (Rocky Point) on your way south. Good little spot to rest up for a few days along the beach front. We stay at tThe Reef Rv park when we go in February. You'll like it.
You don't really need a caravan for Rocky Point , its only about 67 miles over the border, but I'm positive someone will give you info on caravans to Rocky Point. Others will chime in about stuff further south.
A good crossing is at Lukeville AZ.
