Lloyd - this lift will definitely handle a John Deere LX277 tractor. As for the models with the larger decks, it all depends on two key things: (1) the weight of the riding mower, and (2) the distance between the front wheels. This particular lift can lift a riding mower weighing up to 750 lbs. There are a number of larger deck riding mowers that weigh 800 to 1,000 lbs, so this lift won't be able to handle something that heavy. And this lift can accommodate any mower with an outside front wheel measurement of 31.5" to 62.5". Again, these are some larger deck commercial type riding mowers that have a wheel to wheel measurement that is greater than 62.5", so this lift won't be wide enough to handle something like that either.