brad, search the forum for rubber tired timber movers, there was a thread not to long ago I believe. Rahpael and Jim Rogers posted some pics.

Dave

here is a post from a previous thread, called "working hieght"
http://www.tfguild.org/ubbcgibin/ultimatebb.cgi?ubb=get_topic;f=1;t=000468

I like the system in the book "timberframer's workshop"
Build "ponies" that are 16"-20" and use them to support long 8x material(giving a 24-28in working hieght).
If you haven't seen the book, the ponies are basically made from off cut 2x10's.
two peices make legs, these legs come together under the center of a third 12" long 2x10(like a pair of rafters with a plank balanced on top) then use some plywood off cuts to screw onto the sides of the 2x10's... these ponies are lighter than 8x blocks and, as Mr. Chappell says "make good stools"
one advantage of this system is that you can place timbers of any length(I use a pair of 20ft) on top of the ponies, making it possible to roll a dozen posts around on the same setup. Here is a sketch of the pony design, the first drawing I've done since mangling my hand over a month ago...

That felt so good I did another drawing. This is a horse I made a few years back and is plenty solid without being overly heavy. I used spruce timber and made the top beam 7 feet long.

I just recieved Steve Chappell's book Timberframer's Workshop last night. I'm planning to start reading it this weekend.
Glad I could help motivate you in your rehab. I don't quite understand the side view in your last drawing. Is it like Tom's second pic of saw horses or similiar with a lean to the post?

I believe this is the thread Dave Shepard was referring to:
http://www.tfguild.org/ubbcgibin/ultimatebb.cgi?ubb=get_topic;f=1;t=000725

Yes it is, thank you Raphael. I didn't have much luck searching for it.

Dave

brad, the second drawing you ask about...
yes, it's like Tom's second pic with a lean on the post or 'leg'
I looked through my photos for one of those horses and couldn't find one. And the horses are over at the nieghbours right now. The sloped mortise is a bit of a bear to drill and clean but well worth it to bring the end of the beam over the foot of the horse.
And those horses have never needed a tie lower down, just the beam, the legs and the feet. If you keep the m&t connections a bit loose, then you can take the horses apart for transport.

My horse look alot like TC 's . Mine are a little over knee high and will be shortened on my next project. I like setting the timbers on a short timber or two about a foot high is good.
Sharpening chisels is easy. If its new the bevel it's ground at will work for the base angle, just use a fine stone or diamond to put slightly more accute angle till no light reflects off cutting edge. Don't use like this it will dull quickly , it will have a "wire edge". Take a leather belt or something similar and strop it. Hold the blade against the leather and move the cutting edge away . This edge won't feal as sharp but will hold it's edge much longer.