Great buy Lance. You'll be surprised what that little guy will pick up, rated for 5,000 pounds. The manual is right and wrong I believe. Your model, the GCX, has what's called "cushion" tires on it which is what the C means. With The sister model, GPX, the P stands for pneumatic tires. I don't believe you can swap tires because of the model specific fender wells on both are different. None the less, great buy. Im getting a small Mitsubishi LP that's a little smaller than yours, 3k capacity, and putting up a couple levels of rack to store some Cubs 2 high. Gotta customer of mine giving me some old rack so hoping to expand the collection up not out. 
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(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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