back up for lift system
 

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.

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

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.