fenders

Has anybody found a way to make sure their corner bumpers (fenders) stay on when travelling off-road. Mine are constantly coming off when in long grass, narrow lanes with bushes etc. Any genius ideas out there please?

it's not detailed in the manual... I'm removing the fenders to paint. The bolts holding the fender on are obvious and easily accessible except one. It attaches a tab on the rear of the fender to a tab on the front hinge pillar. It is visible when the front door is open. Problem is that the head...