Aww, man, now you have some "battle scars" on your TW too... (Better than on your body though. You didn't mention personal injury, other than to your pride, so I'm taking that to mean you escaped unscathed, yes?)
I am amazed that you found a hill so steep that the TW in first gear couldn't climb it. Of course on sandy soil, I can understand lack of traction, not pulling power, was likely the problem. I'll look forward to the whole tale told again over a burger and a brew this Saturday when the Idaho riders get together. Sorry about the bike but glad you're ok.