It's hard to tell from the picutre but if it's what I think it is, then yes.
My Dad's trailer had these. In the days before sizzer jacks used as stabilizrs, you dropped the tounge a little, put jack stands under these and then took the tounge back up to put pressure on them without using a bunch of blocks to reach the frame.
If you aren't using them for this purpose, removing them should be harmless (I assume they are only connected to the bottom of the main beams and there isn't something else hidden in the picutre)