I assume a product that is sold by multiple reputable dealers has been tested and rated correctly. I have no doubt about the quality and capability of the Torklift product line. My ideal solution would be an extension fabricated from 2.5" solid stock but I've yet to find that. The closest I've seen is the Titan extensions. Those are a bit pricey (compared to the 2" extensions) and too long for my intended setup. However, if I went with one, they don't reduce capacity at all.
Safety is #1 and I wouldn't have started the thread if I just wanted to bolt on the cheapest option. Thanks for all the input!