Woodcutter
RMS Regular
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Fire up a few photos if you can to get an idea...
To provide a durable stone / damage protection the POR15 is the absolute nuts. As it's been said it can be picky about the surface you apply it to. Do note they do provide a metal prep to apply to rusty areas prior to POR15.
Beyond that, I would suggest the BiltHamber products as a cavity wax, additional layer of protection and their underbody coatings. In fairness to @Woodcutter the Dinitrol products have a great reputation too. I can only really comment on what I have used and had success with.
A combination of both POR15 as a hard coating and a cavity wax / underbody coatings would be unbeatable.
We stocked POR15 for a while, but it was more the DIY guys who bought it. Bodyshop customers time and time again buy Dinitrol products, take from that what you will!