Well $hit! I have a story for those of you into Schadenfreude!
If it sounds too good to be true it probably is, and the devil is in the details.
I had asked the seller of the steel building to send me a copy of the drawings (text me an image or two) that came with the building. He said he would but he didn't, but when he showed up today I asked to see the drawings. Guess what the ground snow load rating of the building is? It's shown on the drawing as 20 PSF. Guess what the ground snow loading at my house is? It's 58.13 PSF!
So it turns out that the building was designed for Salmon, ID in a location where the ground snow load is 15 PSF. Had the owner sent me the drawing as requested I could have saved him the trouble of a 4-1/2 hour drive. Now I'm left with the problem of compensating him fairly for his time and effort. He claims that he had no idea about the design specs. Decisions, decisions.
I'm fed up with this steel building debacle. I'm going back to my original plan of making my own trusses.