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Yes, I have successfully used a jumpstarter on my buddy's 6.9 (essentially same as your 7.3) many times - my jumpstarter is self-propelled on 6 big wheels for easy moving around. Only downside is it's nearly 18 ft long and 8ft wide...
I have jumpstarted mine with my 93 cad...and that was allowing the glow plugs to cycle and everything......it did it no problem.
then again, thee cad has 4 1200cca deep cycles, 2 300amp alts all connected by 00 cable....and i have manly jumper cables too; guess thats why i also used it to jump start the cats in the motorhomes. when we travel it always amazes people when I offer to jump something huge using it