Re: Length of winch strap
The longer the strap, the larger the full winch spool is going to be, and the harder it is going to be to winch it on because of the lost mechanical advantage. Short straps winch easier.
If you ever need to lengthen the strap because you dry launched the boat or backed the trailer off the end of the ramp, The strap could be temporarily lengthened by using your dock or anchor lines as extensions.
Never, NEVER!, unhook the winch strap until the boat is over the water and you want it to go in!
Trying to save 20 seconds will cost you an hour one day.