IS the RV parked near where you are now - or going to near where you are now? If you have to drive 50 miles to start the 280 mile drive, then it is 350 miles back home, that will add to the time, and even mean one night along the route. So you are looking at a minimum of 560 miles, perhaps 100 more depending on the stop and start points.
If your time is worth $20 an hour, and the truck is going to get 600 - 1,000 miles on it, that is also worth something. You will have 3-6 meals out on the road too- also depending on the distances, and how far you drive in a day, you might have 2-3 overnights, so more meals, and more time out of doing whatever it was that you really wanted to do.
So well over $600 - perhaps under $1,000. A commercial truck can move it too. They will charge more.
Fred.