Jeff,
SPECULATION that an L series and MX use the same chassis is debunked by a video published by Messick's and readily viewable on U Tube.
The point regarding overall rear R-4 width is valid, My MX is 74" wide and that DOES impact the use of some six ft attachments/buckets.
Exercise care with loader lift capacity anticipation: My tires are not loaded, no wheel weights. Prefer this setup because of extensive mowing in improved landscape surfaces, also refered to as lawns. During a wet spring, and even summer rains, tires can create "tracks". Point is thus. My loader is rated around 2400 lbs at the pivot pins. But my 550 lb snow pusher will unsettle the rear end. There is too much expectation for lifting capacities from these compact tractors. With appropriate ballast, a single ton of weight seems a reasonable limit in a static position. Traveling with that weight at height is irresponsible. Websites and specifications are merely a guide tempered by practical applications and limits.