Mine were not bolted. There was a strap attached the the floor to hold then back while towing but I never used them. Never a problem. Of course it'll be a different story if every in a collision but that would be the least of my worries. Lol. Consider padding the sides most likely to bump with guilts/blankets/pillows etc while towing.
2013 Rockwood 8282WS
Reese Revolution Pin, Reese 16K
2008 Tundra Limited Double Cab 5.7L
Air Lift 5000 w/Wireless Air