Nothing to do?! I don't think I've ever said that, in almost 10 years on the road. There's truck maintenance, housekeeping, laundry, shopping, reading, paperwork, cool websites like Buzzfeed & Cracked, local sites to see, [esp in a van!] - how can you possibly have nothing to do?! Get some blank CDs, make some great road music!
Go to a bookstore and find "10,000 Places To See In America Before You Die". It has things you'd never find on your own, cool little hole in the wall restaurants, goofy festivals, and interesting stuff all over the lower 48 states. [With addresses, phone numbers, and prices if it's not free]
If you can't keep yourself amused [after the work's done, of course] in the downtime, you won't like being out here very much. If you have to be on the road, might as well make it inneresting!