Wouldn't a wax just give more protection though?
Yes it will add an additional layer of protection, but its really light protection (wax) over your heavy protection (sealant) so adding wax over sealant for additional protection is like putting a hoodie over your snow jacket to keep you warm in the winter.
Wax creates shine, sealants protect. Sealants now days provide good enough shine to not need a wax. Like 2005_silverado said, if you live on a dirt road the dust is gonna stick to wax. I'm no expert on the subject though.
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Negative. Wax doesn't 'create' anything... it enhances whats there.
Sealant and waxes most important job is to provide a sacrificial barrier between your paint and elements. Any additional gloss or depth is entirely a byproduct.
Waxes tend to have more of a rich look to them than sealants, which tend to be more reflective, but the gap between the 2 is getting closer. Given that you drive down a dirt road each day I'd save the effort on the wax, plus with silver its going to be a marginal difference. If it was black, dark blue, or something like that I'd say it might be worth it.
Go with the sealant. Somewhere around here are pics of my Z71 is silver-ice-metallic and all it ever got was Liquid Paint Sealant and it looked pretty darn good IMHO