Did the driver that hit you have insurance? If so, do they have high enough liability limits to cover a total loss? If the answer to either question is "no", do you have "uninsured/under insured" on your policy?
Your insurance company should be able to help guide you through the process of repairs, rental cars, additional expenses etc. Make a complete inventory of everything in the trailer and remove anything you can that is of value before it goes to the shop. If it is repairs, not replacement, be sure to seek "loss of value" compensation since repaired vehicles are not as valuable of the equivalent vehicle or trailer with no repair history.
If they are totaled, it might be a good time to consider up-grading if the rigs weren't 100% perfect for what you do. It will likely be a time consuming slog, but most times a grudgingly agreeable outcome is achieved. Good luck.
BTW, how do you know they were going 82 MPH and not 81 or 83 or anything else? And how do you know they weren't braking before the collision? Almost all vehicles have anti-lock brakes that do not leave skid marks. A rear end collision is almost assuredly the fault of the driver that hits the rear end, but don't go adding opinions or speculation when you make your reports. That will quickly raise a red flag in the eyes of an experienced investigator. No sense creating issues when there are none.