rear shocks on patrol ute

hi all, i'm after some replacement rear shocks for my Patrol ute ( leaf spring) towing 2 ton van, the last ones flogged out in 5000 ks,( under warranty still) was looking at tuff dog adjustables, and a good place to buy them , what are fellow travelers using out there? was considering air bags but not sure if ride would be comfortable , its preety bouncy as it is . Most of my driving is hi way with a little off road here and there .
Thanks in advance for any input ,regards Barry Gold coast