One other thing...EMT400's have weak to horrible brakes
Have fixed or modified my GMT400 to out stop some sedans....but...the rear drum/shoes need to be readjusted often
Yours also has drum/shoe rears and suggest manually adjust them to "tight", just to OEM manual spec
Once they are readjusted, the fronts will no longer have to do most if the braking
On long trips, I've readjusted them during the trip....ditto the trailer brakes
Consider buying an adjustment tool and keeping it in your TV's tool box
Another thing is to flush the diff fluid. Especially if it hasn't ever. Synthetic is my recommendation