Check out Rotochoks. They cost a bit more than the x-chock, but don't require a wrench, easily lockable, and they are SOLID. I forgot to yank mine once, before pulling out, and all I did was slide my TT tires on the pavement. Saw someone ELSE do the same with his LIGHTER TT, and he bent-up his x-chocks when they failed.
2014 RAM 2500 Laramie 4x4 Quad Cab w/Cummins Turbo Diesel, 2009 Rockwood 2607, and 3 'yaks!
300W of Suntech Solar, a Rogue MPT-3024 Controller, and a Xantrex PW2000 Inverter