I use the yellow plastic ones. I have a steep driveway and an incline in my back yard where it park my trailer at the end of the driveway. No problem with them. I did forget to put them behind my back wheels one time and trailer almost rolled into the creek behind my house. Tongue jack managed to dig into the dirt and gravel. Now I have a check list to try to keep such things from happening.
The yellow chocks have an end date stamped into them. Maybe get brittle at that point.
2012 Toyota Tundra 5.7 Litre DoubleCab
6 speed, 4.30 Limited Slip, Tow Package
2013 Jayco White Hawk 27DSRL
2010 Jayco JayFlight 26BH sold
Yamaha EF2000is Generators (2)
1996 Honda CB750 Nighthawk