You want guesses? I bet it would hold a small garage....
Real answers: Do you have a Pocket Reference book? I googled and it looks like they have some info in there about wood beam strength. No idea if it has what you need and my copy is at work but google showed hits under "pocket reference book wood beam strength" and said the book has info on 76 species of wood. I would get a book if you dont have one, About $10 and very handy even if for this question you come up blank, you will still use it elsewhere.
You can also google "red pine beam strength" and get a book scanned from an university where they did tests on wood beams. Its the second hit on google by Henry Taylor Bovey, 1898.
Last, any calculations you get you need to figure in the bounce of running down the road, thats really gonna cut into the weight limit because its an unknown. Drive slow the numbers are not too bad, somebody getting paid by the job will go as fast as he thinks he can get away with it so he makes more per hour of his time, then things get dicey.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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