How far have you wheeled in your yak?

BlackAb

JH - Bear is only .4 miles from the parking lot to the water.  The trek I was referring to is "Fish Bay", where I see the beached buoy.  At Bear Harbor I keep track of my trips and end up doing about 8-12 miles in the few days of camping, yakking, wheel-barrowing and midnight beer-running.   

Whoa, I was WAY off,  OK, OK, how 'bout this for an excuse: It felt like two miles on the return to the water in the wetsuit . . . .

I guess you mean just going back to the truck in the parking area for a beer run, right?

Elk is the hardest I have done. I used a well balanced Wheeleze and an adjustable shoulder strap so I didn't have to hold the nose. Could do a couple miles easy. 

if your referring to stripped bass yes. If your referring to large and small mouth bass then no. Even though I have a place down in the delta I still don't know how to fish for them.

  I've been using 10" run-flat 350# per/pair hand truck wheels for  a year.     http://www.handtrucks.com/hand-truck-wheels/non-flat/4567+1663+4294782598.cfm   
   With the cart made of 2x4's  it weighs about 17 lbs. I think ,or pray, that it's bulletproof and hence worth the weight.
   I put 50 or 60 miles a year in on it, 2 mile round trip per launch, and it's just like walking and pushing a jogger/stroller if you balance the load evenly. Hills are exercise tho.
  5/8" steel rod from one hardware store may not fit as well as from another, or rods may vary.

Elk is the hardest I have done. I used a well balanced Wheeleze and an adjustable shoulder strap so I didn't have to hold the nose. Could do a couple miles easy. 

Yeah, I used a chest strap at Elk too, and sometimes other places. Having a bowline & a spare pool noodle (for padding) in a hatch can be a lifesaver when you are faced with a long portage. Just put the noodle over the rope, loop the line over your shoulders & you're golden for any civilized  distance.

I've done my share of pushing munchkins around in strollers, so that shouldn't be a problem...nice find on the 10" wheels.  for your 2x4 frame, do you have it in the style of most PVC homemade carts?  I was kind of thinking something more V shaped, that way the boat could cradle in the V and give it more lateral support...kinda like the one below, but with a deeper "V".

 This is a work in progress and probably not the  best design. Stainless steel u-bolts for the 5/8" rod. 3" screws for lower part of the corner braces. I'd thru bolt if I had a drill press. Large washers and then bailing wire for cotter pins seem entirely adequate. I remove the wheels  and store them in front and lash the frame behind the crate. I guess the 2 by's are extra flotation but don't make up for the wheels etc.
   I only  travel over pavement. This wouldn't  work at all for sand.  You could travois when you got to sand with a canvas or such under the tail of the yak. Listen to the theme from  "Rocky" while so doing.
   Grain of the upright 2x4's should run crosswise so as not to be split by u-bolts.
  I've had no problems with the inside washers being off center.
 
  There are 4 -3" screws on each side running into the top of the frame.

   Except for the thing weighing 17 lbs.,  I've  had no problems with it at all.

  I'm probably going to replace those lateral screws with some sort of screw in bolt.

  added: 1/29-  I changed plans half way thru building this one and it has too many screws in the top section of the upright  2x4. The new one I'm building now will have about half as many. I replace the wood on these every two or three years  anyway even tho they are  treated with Thompson waterseal.

  Try  a google  search for- milk crate kayak cart.