Towing into Yellowstone

We went through Yellowstone back in 2009 with our Coleman Cottonwood trailer. It is a bit lighter than your Bayside. Ford states to decrease your tow rating 2% for every 1000ft of altitude. So figure your tow rating is going to be about 16 to 20% lower than normal at the top. The route from Cody is fairly steep heading into the park. We left the park that way and I remember a long line of vehicles slowly winding their way up the mountain. I would take an easier/longer way myself. Your Explorer should be able to handle it, just be sure to down shift and take your time. Watch your engine temp and if you have a temp gauge for the transmission, watch it. That will be the largest concern is the trans getting too hot. If weight is borderline, think hard about what equipment you have in the trailer that you won't use on this trip and leave it at home.