I'd guess with an OE shock and what your intending to carry, you're probably going to need maximum preload (and that probably won't be enough!) It's different for everybody, so I would recommend a test loading well beforehand and get everything right (chain tension, preload, tyre pressures etc) when you've got time to fiddle. Also try different combinations of load/luggage and make a not of the setting for future reference, so you've got a list at hand to speed things up next time round, or when you want to return to normal 1-up settings quickly. I've fallen into the trap before of loading everything on the morning of a trip and then found myself wasting time adjusting the preload and particularly the chain when I just wanted to get going. The chain tension is the key, the bike will sit low and the swingarm will be at the longest part of its arc; even if you followed the exact setting for chain tension in the manual it is always worth a final check with everything (you, pillion and luggage) on the bike.

Obviously great minds think alike - SteveD beat me to it - must type faster!

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