Here is mine. 4 x 4 with as 5/8-11 all thread rod.
On our older camper
![](http://i23.photobucket.com/albums/b378/JBarca/TT%20Upgrades/Woodchocksandblocks.jpg)
![](http://i23.photobucket.com/albums/b378/JBarca/TT%20Upgrades/TandemTireChocks.jpg)
Then moved them to the current camper
![](http://i23.photobucket.com/albums/b378/JBarca/T310SR%20Camping%20Trips/Delaware%20SP/Delaware11-25-12site873.jpg)
And here you can see them collapsed down for storage
![](http://i23.photobucket.com/albums/b378/JBarca/Sunline%20Camper%20Upgrades/leftbox.jpg)
I put nuts on the bottom wedge block to lock the block and the top just has a clearance hole and flat washer with nut on top. I have a spare 1/2" drive deep well socket and ratchet wrench. I only need to loosen them enough to get them to slide out. ~ 1/4", not much.
To cut the angle, get a torpedo level and hold the block to the tires where you want it to lock up. Put the level on top, level it and then mark the wheels to the block. Take the block off and draw a straight line through the scribed line and cut, test fit, trim if needed and make the rest. Different axle spacing and diameter tires need a different block sometimes.
I went with the 5/8 rod to be stronger and stiffer. Glad I did. I see some use 3/8 rod and I'm sure it too works but I also see them bent. There is also less cranking effort on the larger rod, not that the smaller one is bad, just the larger rod works well and I'm happy with it.
I made mine in the winter of 2003. Still going strong and I'm sure I can get another 10 to 20 years out of them.
You will find when the tires cool down, you can go back and crank a few more turns. Tire OD changes and you "may" need a little more tension to help take some trailer rock out. These home wood ones really make a good chock. The TT ain't going anywhere with them on.
The are easy to build, not expensive and last a good long time. A very worth while build project.
Hope this helps
John