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Done with Blue Ox - a cautionary tale
06-08-2018, 14:14 (This post was last modified: 06-08-2018 14:17 by mbulriss.)
Post: #11
RE: Done with Blue Ox - a cautionary tale
Just a little more info in response to other posts. Here’s a another picture of the fractired clevis that I had thought was steel. I see no signs of prior fractures in the broken ends. Looks all spontaneous to me.

Yes I had a brand new hitch leveler to make the tow bar eye ball level. Think there weren’t some serious sheer pressures involved? My new receiver leveler tube is now 1/2” from straight over the 6” insertion area. I’ll leave it to David to calculate the forces involved. At least it was steel. If that Blue Ox clevis had been, I don’t think I’d be writing these posts.

Still awaiting parts!


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İmage İmage

Mike Bulriss
2001 LXi 43' DS Millennium Edition
San Antonio, TX
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06-08-2018, 17:36
Post: #12
RE: Done with Blue Ox - a cautionary tale
Have you noticed that Blue Ox changed their design. They no longer let that clevis rotate. Here's one of their new bars: http://www.blueox.com/tow-bars/bx4370bx4...t-tow-bar/. Notice that the rotation about the x-axis (the direction the vehicle is traveling) now occurs at the middle joint. The first joint now has fixed ears welded to the receiver tube. I guess we now know the problem with the old design: one of the ears of the clevis fails, most likely the one that failed at the bolt hole, then the clevis rotates and the other ear breaks in bending. Probably doesn't matter if the clevis is made of steel or T6 aluminum, In this scenario both materials would break. The new design eliminates this. More better!

A quick back of the envelop calculation shows that a 5000 lb vertical force applied 12" away from the bus's receiver would bend that bar. If the bar was solid steel, like the Roadmaster extension, than 7500 lb. So, pretty much the full weight of the toad plus some came down onto that receiver!

david brady,
'02 Wanderlodge LXi 'Smokey' (Sold),
'04 Prevost H3 Vantare 'SpongeBob'

"I don't like being wrong, but I really hate being right"
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06-12-2018, 22:21
Post: #13
RE: Done with Blue Ox - a cautionary tale
I reversed theblue ox tow hitch on my 94pt. to pull my h2 from the oem front mounted 2 inch receiver. made a baceplate that fit in the bus receiver. This change sent the tow'ed turn pivot back 3 feet and allowed for better tracking in turns. the LXi has a big swing and tracks well.
running thru dips I roll and drag brakes to keep the train tight. if I had electric supplemental I could just trip the manual stop a bit but the m and g does not have a trailer brake actuator like my semi has

Gregory O'Connor
951-830-5997 So California
current LXi , Prior PT, next Prevost
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