Looking at options to help keep sway down, I look at the safe_t_plus shocks. Wonder if any one has tried a semi-truck shock. About same size at $40 to $80 each.
If you have an older F53 like mine, check the sway bar bushings on the rear axle. Mine were shot when I bought it, and had to be replaced last year, too. Ford doesn't make mine, but there are after-market bushings available. HTH.