Issue with getting this wheelchair to work

I used two HingeConstraints, some welds, and a VehicleSeat to get this wheelchair to function, but it won’t stand on its two wheels. Does anyone know how to fix this?

You can test it here.

Try adding a script that makes the player massless when they touch it.

You need to make some support on the back of the chair

Some smol wheels here:
image

if it isnt, set your hinges to motor, and then when the player moves forward, you can set the hinge velocity.

image
notice that there is a small wheel in the front, and the bigger wheel in the back, supporting the chair
yours does not have the small wheels, and the big wheels are too far forwards