Dennis,
You may not have anything big wrong - I often see that big a split for the tires in the sun. I would still want to get that brake drum off to look at the brakes. I would also take a good look at the brake wiring too as that may be causing the check trailer brake warning.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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