Like Tom, we usually leave stuff on the counters....at first, by accident, then on purpose. Our Keurig rides on the counter as well as all the spices and what not behind the stove. I would check into balancing as suggested? What tires do you have? For balancing, I have the 18 wheeler sized DynaBeads. They balance the tires every time they start rolling (usually 35mph and above)...I also used them on my motorcycle when I had it, those beads can be installed through the valve stem....
TV: 2015 F-350 DRW, CC, 4x4, with 14k GVWR package, 98 gallon TransferFlow Aux Tank, Timbren Shocks
TH: 2014 Voltage 3950, Sailun S637 all around