On the 17th we sprayed some Blaster Penetrating Catalyst on the rails and around the rollers, and it's been sitting since then. Today after having to get a larger hex wrench (5/16) I tried to loosen the bolts on the side for the rollers. Couldn't get them to budge. However it does slide a lot easier than before, not quite able to move it with one finger but definitely a 90% improvement. So I may not mess with trying to loosen the rollers and just spray a little lube up on the rollers for now. My hitch is exposed to the weather 24/7 at the moment, will be looking for some type of cover for the hitch since a bed cover is not in the budget at this time.
If the OP's has been exposed, you might try spraying your rust penetrator of choice and see if that will loosen things up a bit.
2022 Ford F250 Super Duty
2020 Cherokee Arctic Wolf 285DRL4
B&W 20K Companion