If you can find a piece of square tubing the right size to slide inside what's already there and add a few drilled holes for lock pins, you can tailor the leg length to the engine you're working with. Put the front casters on the sliding section.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!