Hey Bill,
Your 5500 has a GVWR of 19,500. Don't know what axles are under your 40ft GN, but their either 2 7K's or 2 10k's. Hauling oilfield equipment, I bet you're running with 2 10K's, thus making your trailer in the 20K GVCWR range. You probably have your truck "registered" at 26K, and are running a total weight rating on your IRP and Apportioned plates at between 36-38K. Right???
With this set-up, there is no avoiding apportioned plating and IFTA filings.
The "Rig" I spoke of above to not have to run under apportioned plating and IFTA and under 26K total was for a "single" unit not pulling a trailer. If you're planning on putting a second rig as you already have (5500 with a 40 GN) you will have to do the same thing as you're doing with your truck.
Here's an idea.......why not stretch that 5500 and put a 20ft stakebed on it as a second rig to haul oilfield equipment? There's lots of guys contracting with both Ace & ACME who are running with 3500's that have 12-16ft stakebeds on them. That 5500 has a GV
CWR of 26K. You could register that truck at 26K, not pull a trailer with it, and run without Apportioned Plating and without filing IFTA. Hell, wouldn't even need a CDL to run that rig as long as you never haul any HazMat loads.
You're on the wrong board for all this.........These guys are in a whole other market/industry/niche than you are involved in. Expediting is a very interesting industry when it comes to what they haul and when they haul it. Check your PM's, I'm sending you a couple of links to where you'll find some "real truckers" hanging out at.