Yeh, I can understand where you are coming from.
To be honest, whatever version I buy, I'll probably remove the rear tub/body/cab floor/etc to gain access to the chassis top, A, so I can inspect it, B, so I can treat and protect it (as best possible). Yes, galv would be the way, but at present, I couldn't afford to go that route. I may though look for a decent 110 chassis, check it over thoroughly and make any required repairs, before getting it galvanised. It'll then sit to one side in my lock up until either the vehicles chassis requires replacement, or I just decide 'Sod it!' and pull the vehicle apart to carry out the swap.
Like so many other people, all ideas at present, but I will be buying a 110 at some point in the next few months, which version though depends on money and distance (I'm right on the coast of SW Wales, so every decent (looking/sounding) one I find for sale is nearly always hundreds of miles away.
Will