It's possible the motorist saw the tire wiggling due to extremely low pressure. When inspecting your tires it's a must to check pressure.

Most conversions, especially XLs, ride extremely low in the rear when the tag is lifted. For that reason I almost never raise tge tag. If driving with the tag raised make sure the rear axle tires are inflated to safely carry the extra weight. FWIW, your rear axle likely exceeds its maximum weight rating and the Feds maximum axle rating. If you must drive tag up, slow down.