I should note that when you buy tiedown straps, don't go to wallyworld, rural king, etc and buy the cheapest thing you can find. Spend some money on good tiedowns. I use ratchet up front, and regular ones in the back. Buy a couple of pairs of softies too.
I had the misfortune of being run off the road while hauling a bike in a truck. The truck ended up on the passenger side as the embankment was steep. The bike was undamaged, too bad the truck was not. Once the truck was removed from the ravine, I rode the bike the rest of the way. I picked iup the truck on the way home after repairs were made. To this day I always pack a pair of tiedowns on the bike when I take a trip. You never know what may happen.