We will need to take photos to post them, so maybe this weekend when we have it out of the garage for some preparation for a June trip we'll try and take some photos and real measurements. My recollection is that with the hitch removed it is very close to flush with the body of the front shell, and that it fits pretty close to dead even with a column in our garage, which makes it very close to 21' long to the rear-most part of the back bumper. But I'll take some measurements to get more precise. The modification puts the propane tanks out on the "swinging" part of the hitch, and because of the tank mount hardware you cannot fully swing the hitch even with the propane tanks removed, so I just remove the whole thing from the front and sit it on it's side beside the trailer in the garage.
When the Car Show came to the Denver RV show a couple of months ago, they had examples of both the factory swing hitch as well as their own modification. They claimed they've been making this modification with this particular welding shop for years without issue, but I personally will be monitoring the joints for cracks like the rash of posts on this forum from 2006 regarding the factory swing hitch. We decided to go for it because it allows us to stuff the 3124 in our garage; we'd previously thought only the 3023 was a possibility. With 3 kids, the extra storage is really attractive.
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Update: I still need to get the pictures of the hitch uploaded, but I took some measurements, and the overall length of the 3124KB with the hitch removed is 20' 6". The hitch looks like it was cut 43" back from the tip and then a 2" C-channel was added to box off the removable tongue, so it winds up 45" long.
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