It's only 400 miles. The tow vehicle is a Van. The dolly puts the nose in the air. Rock chip damage risk vs ease of using a dolly, in this case, it makes sense. I'd do it in a second.
My tow vehicle is a dual wheel Van, with mudd flaps. I've had a couple of boats, towed a bunch, it's all about risk management vs expense no matter how you do it. Open trailor? Closed? Dolly? Two straps or four? I run a "just big enough" open trailor myself, light weight all alloy dual axle. Some prefer the heavy enclosed type, I like to add lightness.
