Utah and National Parks

We are departing tomorrow, 4/29 for a 15 day trip to visit Utah.  Here's a picture of the portion of our National Park map showing the 8 parks (in brown) that we plan to "scratch off" during this trip:

Here's a picture of our itinerary:

One of the issues I've been struggling with is that Basdens RV says my front axle is bent about 1/4 inch, ie toed out.  Found while re-packing my wheel bearings.  I had noticed excessive wear on the tire on the drivers side front last year:

Basdens could not replace the axle before our trip.  So I am going to proceed with a bent axle.  The issue is, how quickly does it wear?  In other words, how long ago did the axle get bent?  We don't remember hitting anything real hard.  I moved this worn tire from the drivers side to the passenger side last year, then put about 600 miles on the trailer after the rotation.  Here's how much wear the 600miles caused:

Can't hardly see any.  So, how much wear will we get over the 3600 miles of this trip?  If too much, then I will be moving tires from the rear axle to the front.  The tires are also 4 years old, I replace after 5 years.  So eventually I'll get a new axle plus four new tires. Stay tuned!

More importantly, check back on what are hopefully daily posts of our adventures visiting these awesome National Parks!