Have a keyless entry, but it is just another thing to break, die or generally misbehave. I would not retrofit any rig with this feature -prefer to keep it simple, a reflection of my choices in life. I keep the keys handy just in case for this particular MH.
Jay & Jo Couture Livin' On The Edge,
w/Dawson, our mini aussie, in a 2007 Monaco Knight 40DFT, towing a 24' Pace "garage"