We will be in Joshua Tree and then Anza Borrego in a couple weeks. I've been watching weather conditions and if they're good, would like to hit the higher elevation campgrounds in Idyllwild and Julian. However, we are pulling a 21ft trailer and have concerns about windy roads. I''m hoping someone might have input on what the roads are like to those places or perhaps a resource where I can get a better feel for the suitability of a particular route for our truck and trailer. Thank you in advance!