Seems to me the dealer got the 'reduced value' of your camper, and you should get reimbursed for that reduced value by your insurance company.
There is no requirement that you repair the vehicle - the insurance company pays for "lost value" ... and if you don't repair it with the claim money, then it will deny the next claim on the same vehicle.
other than that, the insurance money belongs to you, not the dealer. Dealer got what dealer paid for - a damaged RV for a reduced price.
you should pocket the pay-out ($2500) and the lost value insurance check ($5000 + - ) for a total of the original value of the vehicle before it was damaged.