My wheels on my Charbroiler looked like yours. I had been thinking of replacing them for quite some time. My FEC wheels where OK, still had rubber on them but they were on their way out. Like you I keep mine outside on my patio year round.
I mostly use my FEC for big cooks (Briskets, Shoulders, Chicken). I do some catering jobs for my neighbors and friends so the FEC is the perfect unit for me. Also having an insulated unit makes life very easy regardless of the weather.