How not to load a trailer

So I've been working on my rock wall and my rock curb-strip. In order to get the flagstone level, and fill in the gaps, I've gone and bought 3 tons of sand. Two trailer loads full. $30 a pop, so it isn't expensive at all.

Problem is the trailer load bed is slightly behind the centerline of the axle, and although it's never been a problem before, when the trailer is loaded, the CG (center of gravity), is rear-ward.

I had it balanced pretty well, but this morning when I backed up the Land Rover to hook up the trailer, I bumped the hitch, and pitched the trailer on it's tail. I had to laugh.

I scooped out some of the sand into a wheelbarrow, climbed on the tounge, and down she came onto the trailer hitch. BAM! Emeril would have been proud.