I keep reading that Robustas are have skinny trunks. Less than twelve inches. The base of my Washys are much bigger and they're not even that old. Some of the others they were selling had trunks of at least two feet.

Don't tell me that! I need to maintain my academic integrity!

Do you have a tape measure that you can use to measure the approximate diameter of the palm just below the crown? Remember that the diameter will be the final diameter once the boots have worn away (don't take them off, they actually help with insulation which you'll need come winter). If it's 15" or more, I'll be forced to eat my words... The maximum trunk diameter is variable, but usually W. robusta will have a trunk diameter of 14" or less. The bulge along on the ground will be much thicker, however.

Yes, the fat part is the bulge at the bottom that I was speaking of. The top just below the crown is skinny. My neighbors commented that these trees look like giant pineapples.