I do mine a bit differently and don't spend time on the scale connecting and disconnecting if the scale is busy.
When I arrive I tell the scale operator I will need 2 weight tickets (for a 5th wheel) or 3 tickets for a travel trailer (2 connected and 1 disconnected) and will be dropping the trailer in the yard for the last weigh.
Then I drive onto the scale. The CAT scales have a very short front weight table that is designed to hold only the front axle of the truck (that is what you need too).
Position the truck so the front axle of the truck is on the first table, the rear axle of the truck is on the second table, and the camper's axle(s) are on the third table. (My short bed pickup and "smallish" 5th wheel takes a bit of jockeying to get it right. I am close to the rear of the front axle table and close to the front on the camper's table). Wave to the operator or (using a stick you remembered to bring) press the voice button to tell the operator you need your first weight.
If you are weighing a travel trailer this first weight is with your WD bars ON and adjusted. THEN get out and "de-tension" your WD bars and remove them or swing them out of the way. Get back in the truck and signal for your second weigh.
In both cases, now drive off the scales into the yard and find an open spot to drop your camper. Get back in line (if there is one), and weigh the truck alone; same drill. Front axle on table one and rear axle on table two. Signal the operator for your final "truck only" weight.
First weigh is 10 bucks and each additional weigh is a dollar at CAT scales.
For my 5th wheel, I use this sheet to keep track of my weigh history. It is a Word document so you can edit it as needed.
For a travel trailer, you can use most of this but the reason for the WD bars on and off weigh is to determine your actual tongue weight (WD OFF) and the amount of "distribution" to avoid overloading the camper's axles or the pickup's front axle.
Anyway, that is how I do it.