https://www.youtube.com/watch?v=AhDJAfdSC9o
Neat looking way of supporting 5 gallon can
That above is ingenious!!!
I am definitely making one of those 'platform' items, to hold the gas can up there. Am a fairly fit 49 y.o., not a wimp, and I truly was really frustrated with how difficult it is to hold a gas can over my MX5200... It's so damn high, and then the gas tank filler is so far in from the Loader arm, the standing area of the deck, etc... Terrible design for them! Unless you have some type of fuel-pump / hose system, this is ridiculously difficult to fill-up with gas cans....
Now, to the O.P. on this thread -
Am a super-nooby here, so my I understand that my opinion may not account for much, but this is my recommendation.
Why spend extra money to find a 'special yellow' 2.5 gallon gas can, just because it will be your diesel can?
Why not just use your 5-gallon Red can, put several strips of Yellow Duct Tape on it, and call it good..? Spend $3 on a 100 foot roll of tape, and if you get gas on the side of the can, the tape starts to peel, rip it off, clean it up, and put on some new tape! Easy-peasy, done, and the Yellow tape should keep you from making a mistake of putting the diesel, in non-diesel vehicle!
And, as the other guys mentioned, just don't put the full 5-gallons in, and still use the larger sized can, for when you may need the full 5-gallon for something else, and not something that is high / elevated, as the tractor. That way again, you're not wasting the money you've already spent on the can.
Hope that may be another beneficial idea!