If you don't already know the answer to you question about tyres Drew, then they will be fine. Revisit the question when the originals need replacement.
As for rust proofing, if it was costing $1970, then no way! However, the real value is probably in the sound deadening underbody protection and insulation. You need to find out what that involves/includes as this may be reasonable for the money. Any sound proofing of a Defender is worthwhile, but at what cost. You also need to ask if this is a genuine Land Rover product (and cover by your warranty) or just one offered by the dealer (which I suspect is the case, so be suspicious).
Re tint: the windows will already be tinted and I suspect you do not need extra, unless you want you vehicle to look like you are a gangster.
Front mudflaps? They are not cheap but the quality is high. I have seen some aftermarket mudflaps that were a waste of money. There are good ones that are cheaper and installation is not a big deal. When I bought my D90 last year I got them. I could not be bothered going through the hassel to save 0.5%, and don't regret it.
The rear work light is a bit like the tyres. Do you know that you
really need one. You can always put one on later (and probably a better LED one at that). All of the wiring within the vehicle will already be in place, so that should not be an issue later.
Cheers
KarlB

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