Iggy, I wouldn't,think,LED TVs are,any less structurally sound,than LCD TVs. To give you some peace of mind check out some of the newer motorhomes to see any are using LED TVs.
In looking at your pics, I'm not sure,what you have for a mount there. The bolt pattern to attach the mount should be the same,as they are standard. If your existing mount doesn't work try shopping at MonPrice.com. They have a huge selection and the prices are,very good, Make sure you know the weight of the mount. Some of them are still made for the older, flat screens that were,quit,heavy. It weighted more than the Tv
2008 Chevy Silverado 2500 Duramax Crewcab
Jeep Commander - sold
Flagstaff V-Lite WRB26