Yellow flashing triangle

Probably dry wheel bearings. You need to get in and have them serviced (inspected, cleaned and packed with proper grease) as soon as possible.

Try flipping the front tires right to left and so on car may have a radial pull road test to see if it goes right or strait (first check tire pressure )

It's the ESP warning light, You may have a ESP button on the dash which you can push to reset it, Otherwise try having the car idling in neutral and turn the steering wheel fully left then right the back to middle, This should reset the light, if it comes back you will need to get the car plugged into a diagnostic scanner to find the issue.

Hi there:
this is the ESP warning triangle and is normal , what this is is when the wheels start to slip even very slightly the triangle will flash , if you look at your switches on the dash there will be one that says ESP off , if you press this the triangle comes on solid , press again and it goes out.

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If the weight was on the back side of the wheel it's possible that it knocked a wheel sensor for the ABS system. It could have loosened a wire connection for the sensor too.

This triangle might be the warning light that the traction control system is switched off. to switch traction control back on again, locate the button to the lower right hand side of the steering wheel, down beside the headlamp levelling switch. The button should read VSA OFF. With the engine running press this button and the lamp should go out. Note that in slippery conditions when the front wheels start to spin this triangle will flash as the traction control kicks in. Hope this helps. Stuartie.

That light comes on when DSC (dynamic stability control) has been turned OFF or is off due to a malfunction such as a wheel speed sensor or brake pad sensor.

Just press the 4wd button on the dash at any speed up to about 40mph and press again to come out .
When you turn the key on and the oil and battery lights are on the little green 4wd light should be on too if its flashing or not on check your fuses in the drivers footwell.

likely the diff if a whine or if a clonk over bumps the rear shock bushings

That light is the traction control device that's been turned "off". It also comes on if the traction control is engaged. On my it can be turned on and off by the switch next to the drivers window toggle. could it be you hit this switch? If it stays on in spite of the switch, could be a wheel sensor. Doesn't hurt performance (could say it helps performance if it's off) but tire life and driving in rain and snow make it useful to have it functioning.