Picture of Wheels for a Civil Defense Stretcher
My wife and I have three large dogs and participate in animal rescue. A few months ago we had situation where we really could have used a stretcher to move a wounded dog. So I acquired a civil defense era stretcher for future emergencies, and while it is robust the stretcher would be difficult for one person to use. In order to overcome this difficulty I decided to add wheels to one end of the stretcher so it would be easier for one person to move. However, I didn't  want the wheels to be permanently installed as there are instances when it would be better have a wheel-less stretcher. Here's how I did it.
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Step 1: Materials & Tools

Picture of Materials & Tools
The materials (all reused items except the hitche pins) I used for this project are as follows:
  • 1 wood framed civil defense era stretcher
  • 2 plastic wheels (approximately 6" diameter)
  • 2 carriage bolts with holes in their end
  • 4 washers that fit over the bolts
  • 2 hitch pins that fit in the holes of the bolts
The tools I used for this project were:
  • Drill and drill bits
  • Drill bit sizer
  • Tape measure
  • Pencil/pen

Step 2: Wheel Positioning

Picture of Wheel Positioning
The key to this project is placement of the wheels on the stretcher legs. The wheels have to be placed so they aren't inhibited by the hardware on the legs. I solved this by placing the wheels on the inside face of the legs as the majority of the hardware is on the outside face of the leg. Next I verified the wheel was centered on the leg was clear of the one piece of hardware on the inside of the leg.

With the wheel placed I passed a pen through the wheel to make a reference mark on the leg. This will be where we drill the hole for the bolt to pass through. I then measured the distance from the bottom of the leg to the reference mark and marked the opposite leg in a similar fashion. This way the wheels will be relatively even.

This looks good but I think you should use bigger wheels. The ones you got are OK but I think some slightly bigger ones will help out going over rough terrain. Once you add a load the ones you have may not work as well, depending on the wieght.