Check that your tire pressures are at least 22 lbs and with all that weight maybe 25 lbs.
You may also want to check the wheel alignment 1/8"-1/4" toed in.
Try putting your B-in-Law in the front seat and see if the cart still wobbles.
If you overload the back seat they will wander a bit because the front end gets pretty light.
Here's a photo explanation of loading the back seat:
Click to enlarge
You may also want to check the wheel alignment 1/8"-1/4" toed in.
Try putting your B-in-Law in the front seat and see if the cart still wobbles.
If you overload the back seat they will wander a bit because the front end gets pretty light.
Here's a photo explanation of loading the back seat:
Click to enlarge
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