I'm looking for some ideas re suspension upgrades.

Ideally I'd like the vehicle to be less floaty around the numerous windy roads where I live without sacrificing too much off road ability, although TBH. I don't see myself doing much offroad work that anyone would call more challenging than parking in a field!
I've put Koni Heavy Track on the wife's Grand Cherokee and that's been pretty good so I'm thinking of going with that if it's available for the L200 but I am also interested in any cheaper alternatives.

Mostly this vehicle is for the kind of rough tracks that go to most of the houses round us and getting places in floods/snow.

I'm perhaps interested in a mild suspension lift but not if the car would be super wobbly after.

150Kg's of sand above the axle. Seriously though, that's where the problem lies. Yon pickup is designed with a bed payload of up to one tonne. When the boffins designed it, they had to cater to max and min loading as a balance between the two and both on and off road performance. Walkinshaws, as @krutly proudly wields round the depths of the west country, has a back with a coil sprung setup. Have a look at Pedders uk uprated kit, and a set of poly bushes to replace the current rubbery ones.

Basil put uprated coils and old man emu shocks on his and said it transformed the handling ---------> g64-Basil-s-Trucks.html