A little searching on Google lead us to SDHQ Offroad in Phoenix AZ. SDHQ has a lot of cool offroad parts for Toyotas and the Tundra and they make a super nice billet heavy-duty billet battery terminal kit. They told us that breaking the terminals in off-road use is a common Toyota thing so they developed these heavy-duty terminals to fix the issue.
The terminals themselves are stout! They are machined from 6061 billet aluminum. That is not going to break! New steel OEM terminals fatigue and snap, old fashioned lead terminals stretch and get loose, and old style zinc terminals corrode and fail. These aircraft aluminum parts will not! The SDHQ terminals offer a large cross-section for minimal electrical resistance too. The hardware for the terminals is all noncorroding stainless steel as well.
The terminal have provisions for the OEM cables and for four additional power and two extra ground takeoffs. This is good for offroad use where you have lights and if you have an audio system. We used our terminals for our aftermarket radio and our intercooler coolant pump.
The SDHQ kit comes with a handy large gauge eyelet in case you need to repair a corroded or broken OEM eyelet. Some shrink tubing is also provided to repair any insulation that needs to be restored when changing a terminal.
Some anti-seize is also provided for the stainless hardware.
Here is the positive terminal all hooked up to our Optima yellow top deep cycle battery. The intercooler coolant pump and the sound system are hooked up to the back of the SDHQ terminal. We are pretty confident that this is never going to fail and if we add some off-road lights later we can cleanly tap into the terminal for power.