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Maybe you should rent one of the size you're considering and see how it does on your jobs before you buy.
I use an 11 hp 4000 psi Craftsman that I bought new on eBay. There are probably better brands, but this one was a good deal and has been working well for about 3 years. For a pressure washer, I would rather have a unit that is a little more than I need rather than not quite enough.
Trust me on this one (11 years as a John Deere tech). The key is hot water and high GPM. Pressure isn't all that important when cleaning tractors and farm implements. A good hot water PW with a diesel or propane fired burner is what you want. Even 1000 psi @ 4 gpm combined with hot water will run rings around 4000 psi @ whatever gpm for cleaning tractors. High PSI + cold water just blows paint off tractors... and the paint chips will still be dirty.
"HONK if you've never seen a gun fired from a moving Harley"