for going 150' over grass I'd just get 2 inflatable wheels, about 4" wide, a length of plain rod or all thread as wide as you need for an a axle, and a piece of 2 x 4 that's about 10" shorter than your axle. Because this is a "low rider" you want the 2x4 at least a couple inches wider than the spot where the boat will rest on it, or at least as wide as the widest part of the hull
Fasten the axle rod to the 2x4 so that the rod sticks out about 5" on each side, attached a wheel to each side. Flip it over, set one end of your yak on top, and lift and pull the other end. if you lawn/dock has some rough terrian, add a bungee cord that will go over the boat and clip to the axle rod on each side.
You could easily do this for $40 or less, in less than 20 minutes, with very basic tools and little or no mechanical abilitity