Jason:
Dexter Axle information:
Go here for your product details:
http://www.dexteraxle.com/
Here's a good Dexter axle measurement PDF
that shows how and where they measure things.
Go here to find a distributor and costs estimates:
http://www.dexteraxle.com/find_a_distributor
Go here to talk to customer service:
http://www.dexteraxle.com/contact_us
You might go to this thread if you are going to make your own frame.
This will show how "Hub face to Hub face" and "Wheel offset" measurements
that will affect your sizing of your axle choice to your built frame.
http://tnttt.com/viewtopic.php?t=13966
http://tnttt.com/viewtopic.php?p=181524#181524
Fitting car tire rims to your Dexter axle information below:
http://tnttt.com/viewtopic.php?p=189290#189290
Find more information on axle length as it relates to tire hubs here
http://tnttt.com/viewtopic.php?p=181524#181524
Weight estimating data, collected, mostly from Northern Tool's web site
http://tnttt.com/viewtopic.php?p=194840#194840
There are a set of questions that you should decide on before you order.
1. Determine gross weight
2. How many axles do you need?
3. Do you need brakes?
4. What is the hubface to hubface dimension?
5. What bolt pattern do you want?
6. What are the outside frame dimensions?
7. What is your desired trailing arm start angle?
There are lots of options, they will custom make the axle to meet your needs.
Read this thread to get more details on the Dexter axle and where to buy:
http://tnttt.com/viewtopic.php?t=15386