only if the durometer of the bush is greater than an OE rubber one.
The design of the bush has a lot to do with it too. If you look at the photos check out the circumferential groove in one of them. That one goes on the back side of the radius arm/chassis mount. It allows more flex in the bush.
The lower rear trailing arm/chassis mount bush from Super Pro also has a similar design on both sides of the mount, allowing more flex and less stress on the chassis mount than an OE rubber one.

