This was an exact replacement for the original which broke after over a decade of use. It's not so much about the timing as it is about the bumps and knocks of these blocks that will likely cause them to fail over time as the RV is used. In my setup, this unit was not installed very carefully from the start. When I replaced it, I made sure it was securely bolted to the wooden floor so vibration and jarring during movement was kept to a minimum. Ideally a shock absorber would be best but if it lasts ten years then the price is worth it. The batteries are charged to the correct voltage and handle our rig's 12v load well and are fairly quiet.
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