The Polish Enhancer, not sure what that will do, and keep in mind that Wolfgang Finishing Glaze is not in fact a Glaze, but an ultra fine finishing polish.
The effects brought out from the Finishing Glaze are very minute because it is so fine a Polish. These effects can only be best realized and brought out with a D//A Polisher, and still just very minor gloss enhancement for that very last bit of gloss prior to a protectant applied. By hand you won't see much of anything perhaps except for some bit of cleansing of the paint. But in any case you won't be hurting your finish if you use it.
If you should be able to Clay without incurring any damage such as minor sleeks, then I'd say go directly to WG Deep Gloss Paint Sealant, and you're done!
WGDGPS 3.0 really needs nothing over it, it looks killer all on its own, dripping wet gloss. To keep the look uo, I'd consider a good Detailer Spray, on the cheaper side could be a product such as Duragloss Aquawax, very nice, great bang for the buck, good as a drying aid also.
A little more expensive, then choose a Detailer Spray from Wolfgang, or another great one is Pinnacle Crystal Mist.
For vinyl trim, and all rubber weather-stripping, Wolfgang Exterior Trim Sealant (WETS) is superb. A little pricey, but worth the money, a little goes a long way, it dries to the touch, won't run or streak with washings or rains, and it lasts quite a long time.
Seems another nice trim dressing product that many people are also liking is Aerospace 303 Trim Restorer. Never tried it but some seem to speak very highly of it as well.
WETS is a little expensive to be using on Tires though. For Tires, Optimum Opti-Bond Gel, or Optimum Tire Shine are both excellent products, and you can trust any of the Auto-Geek House brands as WG, Blackfire, McKees, Pinnacle as well, not a dud in any of these product's lines no matter what you buy.
The Optimum Tire products would also be safe to use on weathestrip as well, are water based.
