TL;DR - The rear axle seal replacement seems to worked beautifully and there is no more leaking at all.
My trip to Canada and the Whipsaw Trail was cut short when I discovered a leaky rear axle seal on the driver side. Upon my return, I replaced the seals using the Step-by-Step Guide to Replacing the Rear Axle Seals & Bearings I'd put together when doing the job on my 3rd gen 4Runner, and the project went off without a hitch. I hadn't driven the 4Runner much since doing the job, and the job on the Tacoma was done only a couple days before leaving for California and Colorado. I'm happy to report that through the entire 4500-mile journey, the seals worked flawlessly, and I suspect will continue to work for another 100,000 miles or so. This is a job I entirely recommend doing yourself if you have the same problem - with the right tools, a little time, and the step-by-step guide above (which also links to the necessary parts and tools), it's easy and satisfying. Plus, you'll save yourself about $1000.
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