I've done all my 4 corners at CAT scales.
It takes a little coordination with the scale master but...
You will need to do a scout trip to make sure there is room on either side of the scale to have one set of wheels centered on the scale and the other to one side or the other.
1. Got to office, tell them you will be weighing twice. Give or take your specific area's normal prices, mine (IL) cost me about between $9 & $11. Generally, I get charged $1 for a "re-weigh" on the second trip.
2. Drive onto the scale as normal. You will see 3 pads. Front wheels go on Pad 1, rear set on pad 2 (if you have a tag, I haven't had to coordinate that yet so I can't be too specific.)
3. After you get weighed you will need to exit the scale and come back around.
4. Drive onto the scale with either the right or left side wheels on the centerline of the pads as follows:
- Front on pad 2
- rear on pad 3
This puts you behind the arch that is over the top of pad 1. If you have done a good job coordinating, you might be able to hear the weigh master tell you through the speaker that they got it. If you have a passenger, you could have them standing outside to let you know it is done. You may need to back up a little bit to get through the arch but not a lot.
5. Go to the office and collect 2 weight slips. Slip 1 will have your full axle weights and slip 2 will give you the weights of the "corners" you drove onto the scale. Simply subtract the front corner from the front full axle and you will have the other corner. Repeat for rear axle.
Of course, don't try this on a busy day at the CAT scale. Don't be intimidated by the process. After you do it once, it gets real easy to repeat at any scale. The trick is to scope out the scale for room to the side. You can get a good idea about this using google earth to check out the location.
Check out the CAT web site for locations and videos.