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					Originally Posted by Destroyer  The problem with most tarps is they are thin plastic, and they are square, which means that you always have a lot of extra cover hanging all over the place. And then you have to use bungie cords, weights, etc, etc to try and hold them on....yuck!! 
I don't use a custom fit cover, but I've had great luck using a swimming pool cover. They are extra heavy duty plastic for safety reasons, lightweight, last forever, and, if you buy an oval one, they fit very well....Plus they come with a wire cable and winch that you can use to hold the tarp to the boat trailer nice and snug... And, compared to custom tarps, they are dirt cheap. The one in the pic is two years old, was $57, and it covers the V20 perfectly.    | 
	
  I have to second you on the 
Winter pool cover Destroyer.

 I use them as a Winter  storage cover with a 2x4 frame running amidships, bow to stern. 
My current project boat was under one for three years and held up. When I  took it off, the boat was in the same condition as the day I covered  it.
They outlast even the best of the poly tarps the chain stores sell.  Besides being made of a heavier mil poly, (available in different  thicknesses) they contain a UV shield that stops the Sun from breaking  it down (the others end up looking like cheese cloth after a couple of  months).
The oval shape
 is the way to go and you can find all sizes  on ebay (cheap!)
Even if you buy the canvas cover I recommend  a 
Winter  pool cover to put over that for the off season. It will keep the Sun and  other elements off the one you want pretty for boating season.
     Speaking to trolling motors, I use a my boat for saltwater fishing and have a  1980 Johnson/Evinrude  15hp.w/power prop. The 9 -15 uses the same chassis (about 70lbs) so you  can choose the power to weight ratio.   I found a rebuilt 
Electric  model (ebay/$375). It has a 2amp. alternator that keeps up or  even recharges the batteries in the event of trouble.  She truly serves  double duty- (trolling / auxiliary). 
Heck, with fuel prices the way they are I'll be doing a lot of trolling  this season. 
 Hope this helped...