Outer Limits 4x4 Board

suspension starting to sag need advice on what to replace it with

ute has a steel tray with canvas canopy, long range tank(90l)

bull bar(steel)with brush bars, low mount whinch, dual batteries etc

used as a daily drive (empty) but loaded when touring

looking to lift by 50mm from standard

Any advice welcome

Mate most suspension in Aus is done to australian standards so you are best just to see what springs are going to suit your application best.
the 2 i would stay away from would be blue max and iron man, from experience they are a cheap kit because they are that, cheap.
With buying kits check what you get in the kit , a couple of the cheaper brands miss out on a few of the parts which make them look cheap but really false economy.

if you want flex than probably belton or EFS if you are after a more ridged tourer setup than go for old man emu of TJM.
Its my opinion and im sure their are a lot of different opinions