I am pretty sure it is coming from the suspension. I think the air is expanding as the temps rise and then decreases when it gets cooler at night. We will be sitting outside and will hear it pop from time to time.
We are going to start placing a few "Lego Pads" under the tires to make sure that the tires are not off the ground. I will make sure all the bolts are tight and then we will see if it improves any.
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