We had the Whirlpools installed in our Key West. We haven't used them a lot but they seem to work well. Manage your load size, smaller is probably better. Get the dryer that vents outside the RV.
If you don't already have one, install a drain pan that drains outside the coroplast liner. Also, ensure that you can reach the water shutoff valves, which may mean that you run some extra hose length and have the installer put in water cutoff values that you can reach them.
We failed to do this and, while we haven't yet had a problem, it haunts me that I didn't demand these two safety measures when the dealer installed the w/d. If one of the washing machine water hoses springs a leak, I'll have to shut off water to the entire RV until I can remove the dryer (which is on top) to get access to the water lines.