Dalmationlovers, First off, I am no expert but I do have 64 years under my belt. From experience Over inflation is a very real concern. Dakzuki and Snowdance have given you good information and I agree. One of the better investments I have made was an Infrared Thermometer. If something starts bumping or shimming stop and use it on the tires. It saved me twice, well worth the $20.00 I spent on E-bay. Exact temperature is not important but if five tires are around 118 deg F and one is at 145 deg F, you have a problem.
The primary thing is that all tires are around the same temperature. The same logic can be applied to wheel bearings on trailers as well.
I would wager you have a separation, possibly caused by over inflation.
I am no expert and advice is only from experience.