Hello tmac. Just to add to your upgrade list; you said you experience tail bounce when going over bumps with your load? The OE Tokico's are ok shocks but if you really want better load control, consider air bags or heavy duty bilsteins and TufTruck HD rear coils. JMO.
Total Chaos UCA's, Fox 2.0 IFP Coilovers and shocks, TTC-1223V variable rate coil springs.(Mods list)