Well, it seems you're not a stalker at all anymore Bungle, welcome aboard!

on all that Bill said above.
Neither me nor my 80 do overlanding or green laning, but we both enjoy going offroad, which I suppose could be compared with green laning, depending on how green (or brown) the green lane might be
The decision whether certain items are essential or good to have is a matter of judgement and somewhat arbitrary IMO.
I have a winch, do I need a winch? On occasions I have needed a winch, so my answer is yes, I need a winch. Is it essential? I think yes, because I have nobody I can call to help me in the event that I do need it. However, many would say (from their experience) that they don't consider a winch to be essential. That's their opinion.
So we come back to your own judgement, right or wrong? Only you can answer that when you're stuck on a side slope, in the gloop, and 5 m down the hill from you is a near-vertical drop-off to oblivion.
It is fun, as Bill says, and it's also expensive. But, it's so satisfying when you're done (if ever) and you have a well turned out piece of equipment, especially an 80 series, equipped with the essentials and the nice-to-have's that you chose to have, and you can go ahead either to Tesco's or the back of beyond with some confidence that you will return.
You've posted your list and with or without the rear wheel carrier, it's a reasonable list for starters.
My advice is to keep it clean. That doesn't mean don't get it dirty, heaven forbid, but keep it clean in between. It helps you to "know" your truck. Clean underneath means no wet salty mud held against already rusty body and chassis members for months on end promoting rust.
Clean underneath means you look, you see that oil weep on the transfer box starting, not when it's too late and you've dumped all your oil and the t/f is whining in agony. You see that the rear UJ on the rear prop has rust stains on one of the bearings, it allows you to squib some grease in there in the meantime while you organize a replacement, and saves you from a loud bang and no drive on one of your green lanes, and all the hassle that goes with it and the disruption to the rest of the gang having to wait for you to sort out your problems.
Keep it and the bolt-on's maintained, it's your lifeline after all, maintenance is as important as bolting the things on in the first place.
I have OME suspension, it's been on for 11 years and has never given me problems. It's not the only make, I just can't recommend anything else by experience. Peddars appear to give very good attentive service (from the experience of others that have said so) and there's many others with mixed reports.
I've never felt the need for a snorkel, in the dry weather we have dust, but I don't do convoys, so most of my dust is behind me, away from the air intake.
As for river crossings, well, I have an aversion to dunking my starter motor, alternator and other more sensitive stuff under muddy water, many do and get away with it. With near to a 6/7" lift, I haven't needed a snorkel for water crossings, the top of a 33" tyre is deep enough for me

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Carry a basic set of recovery equipment with you at all times! A good snatch block, a good strap for tree protection and other uses, use dyneema on your winch, not steel cable, carry heavy duty gloves, lengths of good rope, some chain I find useful personally, and a bunch of rated shackles, basic tools, socket set and spanners / screw driver's and with a medium hammer and big f**king hammer (at least 2-3 kilos) its all good added insurance for when things do go wrong, and that's not you necessarily, it's any number of your green laning mates, especially the green oval type, but they usually carry their own spares and tools, for the same reasons as we drive Land Cruisers.
It goes on forever and I've probably missed over half of it, enjoy, it is huge fun getting it right
