I traded trailers once and found my wheel spacing was not right for rotochocks. Called Pearl (probably not long before they died) and got another size. Thus I now have an extra size of side plates. Should be good for life. Try to find a used set. I definitely put chocks on soon as I park, and they are the last thing to come off. I have had a trailer move on me soon as hitch released. My repair shop has really hard ground, and if I don't chuck trailer will slide backward rather then hooking. I think chocks of some sort are very important.