Simply so, what does Timbren suspension do?
A Timbren suspension enhancement system will greatly enhance the performance of a heavily-loaded vehicle by adding to the spring rate. You can expect reduced sag, and improved roll stability.
Secondly, which is better SumoSprings vs Timbrens? The Timbrens are made of a much denser rubber than the SumoSprings which means they will provide more support but less ride comfort. It really just comes down to how often you will be towing/hauling and how heavy of load you will have.
Keeping this in view, do Timbren bump stops work?
A better alternative to factory bump stops is Timbren's Active Off-Road Bumpstops which provide a soft, comfortable bounce when the vehicle bottoms out. If you're planning to leave the pavement and cut to the off-road trail, you're quickly going to find that factory bump stops are woefully inadequate for the task.
Do Timbrens springs increase payload?
A helper spring is designed to allow you to carry more weight with your vehicle. All in all, your vehicle will sit level, corner better and ride smoothly over rough roads. Even though an installed Timbren SES kit will enhance your vehicle's performance, this will not increase the payload.