My wife did not like double bowl sinks, which is how our Eagle was equipped. Changed to a single bowl high quality home type stainless sink. If your original drain line is sized at 1 1/4", you would need an adapter to go from the 1 1/2" size on the new sink. These are readily available in plastic.
The biggest concern is the layout of the cabinet under the sink. I was able to find a larger sink that would fit, but enlarging the factory cutout and leaving enough countertop to allow for the mounting hardware was the first consideration, followed closely by the depth of the sink...do lots of measuring of both the cabinet and the sink with drain fitting installed! I was able to fit everything together so that the bottom of the trap wound up about 1/4" above the shelf - a tight fit when assembling, but it works fine without having to cut a clearance hole for the trap.
My wife was very happy with the sink, but we did have to acknowledge that going from two small bowls to one big one can take more water...our 2010 was the year before Jayco doubled the fresh water tank size on this model. Only a problem when dry camping, but something else to think about.
Also, I can just about guarantee that eventually someone will not be happy with the look of the original (white, in our case) equipment plastic faucet sitting on the shiny stainless steel sink...much easier to replace at the same time as the sink!
2010 Eagle 31.5RLDS
2009 Chevy 3500 CCLB Dually Duramax