Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
If it were me, I'd figure out a way to tilt the trailer up (or down), and empty a can of PB Blaster into the upright end of the extension / outer box section joint and let it soak in for at least a day.
Can you get to the rear end of the extension tube? Maybe cut down a 4x4 post to fit inside the outer box section and pound out the extension from behind?
If it's bent, neither of these are probably going to be very successful.
David C-250 Mainsheet Editor
Sirius Lepak 1997 C-250 WK TR #271 --Seattle area Port Captain --
Drilling holes through the outer section may do more harm than good, as there may likely be a burr created around the bottom edge of the hole where the drill bit enters the gap (now presumed to be filled with relatively soft rust) between the outer and inner sections. That burr would be forced down into the dimple where the bit enters the inner section. Unless there's so much of a gap that the entire point of the bit passes out of the outer section without the point of the bit starting to cut into the inner section. It that's the case, however, I would expect there to be so much play that the inner section would not have bound up. You're far better off tilting the trailer up (even a good hill would help). Good luck.
The trouble with a destination - any destination, really - is that it interrupts The Journey.
Lee Panza SR/SK #2134 San Francisco Bay (Brisbane, CA)
What about blocking the wheels so they can't move, and pulling on the extension with your truck? I'm assuming the extension has a tow receiver on the forward end. If you can take up tension with the truck & then have a helper bang on the outer tube with a mallet or 2x4 or other suitable implement (you don't want to dent it with a hammer), you might be able to jar it free.
You could also apply heat to the outside & run water down the inside. This would expand the outer tube and (hopefully) contract the extension. A weed burner extension would help you to not over heat the tube.
David C-250 Mainsheet Editor
Sirius Lepak 1997 C-250 WK TR #271 --Seattle area Port Captain --
Lots of good suggestions here but as to your inquiry about ATF fluid and Acetone I can tell you that i used it to remove the nuts on my keel and it worked like a charm. much better than any store bought product that is available. Look up the results of others on the internet you will find a lot of good info.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.