Originally Posted by ROBERT CROSS
30+ at GM Stores....
I've never seen shim slop cause a receiver failure....
It's always been cracked welds and/or rust or just plain, poor design.(round tube,short mount arm)
My point wasn't that the shim caused the failure, but rather that using it/them to tighten up a failing receiver only served to preserve the contact surface to continue the failure problem, without resolving it at all.
If his receiver 2" or 2.5" square hole is getting bigger due to either welds failing &/or the metal itself stretching under load, then shimming it up is doing nothing but fill the gap to continue the stretching &/or weld cracking process.
So again I say, if this receiver is already compromised by the heavy load of a relatively large/long/heavy AS - with or without the WD tension/torque cranked in, then that load will continue to push on the receiver to continue the failure process, made worse by bouncing along highways, etc..
IMHO it's tempting fate to tow 1500
miles with a compromised hitch. He may get home okay - but that would be luck as much as anything else, & rechecking that hitch every couple hundred miles may get a warning of final fatal failure ... or maybe not!?
What's that 2015 30' AS worth, versus finding someone to repair or replace the now faulty receiver? .... & knowing there is a problem & not resolving it, then have a damage claim could negate his insurance coverage as well.
If it were me, I'd vote for being conservative & get it fixed/replaced somewhere ASAP - even if nobody in that FL can work on it, & drive somewhere else to get it fixed before towing anymore.
As a licensed Architect for 35+ years & in the construction industry for 50+ - I know something about structural steel failures & preventing them, fortunately none in any of my buildings/projects.
Also, I've used those Curt Rattle Stop U-bolt appliances for my bike & cargo racks, but wouldn't advise them for any WD hitch, since their u-bolts & nuts are not made from strong enough steel for the forces - particularly on a 30' AS jumbo jet.
But personally, I don't find occasional movement in the receiver on turns from our Hensley Cub troubling, & I use a shot of WD40 per the good AF Sargent's advice & that of Terry Powell at Hensley, in order to make the stinger's shifting around a bit smoother.
As opposed to the Curt hitch you show for a GM product, the Ford F150 & 250 hitches have 2 huge plates at L & R which bolt up to the rear side frame members to transfer the WD TQ better than most. I'd assume that the Ford 1/2 & 3/4 ton SUVs would be similar, if not the same design.
However, I'd think of going with a greater than Class V hitch for this 30' jumbo AS .... just to be safe & have more margin of error.
Then Ted, the CanAm guys can do whatever additional mods they see fit when you get home.
Rod, some of the OEM receivers have had some known weak points, but I don't know if this Ford setup is at fault, & tend to agree with you on the rating be short of what the 30' AS needs - & IMHO that F150/250 design is a good one, but just needs to get a heavier duty Class V or better one, as noted above.
Happy New Years All!