Also, on the head-on shot above, you can see the "boobs" on the bow. When trailering, you're not supposed to leave the poles in, but the wind would shove the cover down into the bow, and after getting caught in the rain twice and having to bail/pump the water out of the bow, I decided to tow with two beach balls in the bow. They don't allow the cover to get pushed down into the bow seating area as much, and they "give" so the cover isn't stretched (that's supposedly the reason not to tow with the poles in). They work so well, I haven't used the poles since I got the beach balls.
Intex 42" beach balls - 2 pack
I do the same with a 5' beach ball, which can be seen in the rearward shot. Again, there's just enough there to keep the cover from flapping or getting shoved down by the wind, and enough give not to stretch the cover out. At the very worst, I figure the wind is beating the hell out of the cover and stretching it out just as much, so worst-case scenario, I feel this one is a draw. I have
this air pump - LINK which works very well, if I were to need it for trailering away, but I'm blessed that I just store the beach balls, inflated, while I'm using the boat for the weekend.
The 5' beach ball has a Boston valve. If that had the "regular" type of valve, I doubt I would use that thing. If you can find some beach balls with Boston valves, those would be the best way to go, and you should link them up here somewhere on the forums for others to buy. As it is, all of them work just fine for me. On the smaller 42" pair, a pen in the valve will keep them open for deflation once you unpack, and it'll give the wife something to do so she's not bugging you while you're getting yourself settled in the boat.
If you can suss out what size the hole is, some poly tubing (like the stuff for a water line to the refrigerator) of that diameter, stuck in the valve, would let you deflate those things lickety split. Same goes for ANY inflatables on your boat, if they don't have a Boston valve.