side note about bearings.
After our first Grand Canyon trip, as we motored out of Las Vegas and 4 hours into the desert the bearing gave out on our trailer. We rolled into a gas station and the friendly owner agreed he just might have a new one just for us. After we pulled the wheel and the pieces of the bearing fell out, he got cranky, told us to get our piece of s%^$ off his property and even started hooking his tow truck to our truck. The thing is, that damn trailer probably weighed a couple of tons, and without a bearing moving it at all was probably fatal to the axle, wheel, or whatever. In any case, calmer minds prevailed (I started filming and told the putz my brother was an attorney) we limped the rig off his property and I spent a miserable day in the shade of the trailer while the others ran back into Vegas to find a bearing.
Moral is; if you trailer, your trailer needs a repair kit as well, to include a bearing, grease, spare light bulbs and so on. Or, you can eventually have a similar adventure to mine. Sucky way to end a GC trip.