Welcome to the Optimum Forum! I wouldn't think a new truck should need clay (unless it sat on a lot next to a manufacturing plant for a long period). Decontamination with FerreX makes sense (and is safer). One pollutant new vehicles can pick up is rail dust and FerreX is excellent at removing. Your regimen with Opti-Seal and Wax should keep you well protected.
I answered this via email, but we don't recommend drying without some chemical protection. Rain will not effect Opti-Coat Pro+ and will only spot if it mixes with minerals (dirt) on your paint. In a timely fashion you can use a leaf blower to remove the water. You can use instant detailer as a drying aid, but the less you mess with the coating for 7 days the better.
You should get that, and if you use Hyper Seal as a drying aid every couple of months (spray on wet panel, then dry as usual), you will be protected all winter. Interesting phenomenon, ice and snow frequently slide off coated/sealed cars, the hydrophobic benefit.
The pre-spray/instant detailer ratio is 1 oz to 16 oz of water - works well on bugs, tar, heavy dirt buildup, etc. ONR is not as effective as a drying aid as Opti-Seal, Spray Wax, or Instant Detailer, but the pre-spray formula would be your best bet.