Today we're going to take a look at the Rackem B52 Locking Round A Frame Trailer Jack. This is the top wind design that's going to offer 15 1/ inches of lift, part number is RA-29. Now what is really going to stand out about your B52 from Rackem is that it's a locking jack. What we can do is we are going to extend the jack all the way to its highest position, we press this little cylinder lock… see more >