Yup, been there done that. We were robbed (car, jewelery, computer, hunting gear, tools--$40,000), then the hail trashed our roof two months latter ($13,500), heavy rains leaked through the roof and trashed a whole side of our home ($21,000) then our basement flooded ($7,000). Yup, she was a bad one last year!
Did you crash it or did fall of the trailer? If you crashed it, you need to go to the hospital NOW and get a physical even though you might "feel" ok. If anything medical comes up later, you will have leagal recourse...
As for the machine, if it was BRAND new, some insurrance groups will give you replacement value BUT will take some off the top for depreciation. That said, they can compare sled here with some in Timbucktoo but they have no legal recourse to do so. They have to use the a dealer BlackBook to establish a fair price and they have to match options you added. This is especially true for older machines. Remember that they will take some depreciation off the top too for those options.
Best thing to do is negotiate with them hard and don't back down either. It's in their best interest to make money regardless of the relationship they want to create with you--everyone needs to be insured--which sucks. They may want you to buy another machine and then cut you a check for it which will then put you in a bad spot...
Good luck! You're gonna need it!