Cap'n Morgan wrote:
Take the tires off the trailer, put it up on blocks and buy one of these to cover the entire boat, in addition to your boat covers. Don't even bother with gravel or a pad. Only $300
+1 on the portable shelter as long as it is secured and you can get totally enclosed. Those things get ripped to shreds in a windstorm if not properly secured.
I would say that a concrete pad is always VERY nice to have if you can afford it.
My vote is a concrete pad and a portable shelter... Then, when the portable shelter goes south in a few years, you'll either want a bigger boat anyway, or you can build a garage or carport or something.
You've got some land... use it. barns and outbuildings (when done correctly) are always a good investment for your home. You'll get your money back on it. Same for the concrete pad (RV parking).
finished concrete shouldn't run you more than 3-4 bucks a square foot... so, a 10 X 20 (or bigger if you can swing it), is still very affordable. A nice, 15X30 outbuilding on your property would probably be a good investment (and a nice shop!) It would give you room on both sides, support anice, 12' wide X 8' tall garage door quite easily...