Suggest you crawl under the unit and -
1. Tighten the nuts for the tie downs in the garage area and/or double nut them.
2. If the slide makes a squeaking sound extending or retracting, lube it and only use CRC Power Lube w/PTFE per the mfg. Here is a video link:
3. The tire may have alot of tread but check the date code on each tire. ON my unit, purchased new, discovered the tires were 2 years old!
If you run into issues, always ask questions as many well educated members here.