I have a 2000 17 ft hi lo. I have read that some come with a crank back up if electric lift fails. How will I know or where can I find this option?

If you have one, it will be on your pump/reservoir in the battery box. You should see a place to insert a handle on it.

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2404T, 2003 2500HD 4X4 GMC Crewcab w/Astro camper shell
Far West Texas

It should look like the pumping mechanism on a bottle jack.

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Great Wife, Joyce
2010 2310H Hi-Lo
2012 F150 4X4 SuperCrew EcoBoost w/Leer Cap
Reese WD Strait-Line Hitch
Amateur Radio K3EXU

Just further carifying from question to answer:

It is not a crank, it will be a pumping mechanism, attached to the pump, should look like this:
YouTube - ‪7 Hi-Lo-TLift pump backup‬‏

of course the manual pump was an option for many years, sounds like std equipment in later years.

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From Kansas: 29ft '95 5th, converted to toybox in rear, by Hilo. Pics soon, Some Here.