Yep 1 1/4" receiver. Darn now I'll have to install a rear camera so I can watch to see what is happening.
We discovered ours when we stopped and did the walk around. The bikes were laying on their side ready to fall off. That's when I put my foot and weight on the bike rack to discover the entire receiver flexed horribly. Somewhere on this forum there is an old post I made with a short video of the flex.
A camera will not help. Might be to late once they fall. Mine never move back there as I have my unit and truck set up properly.
If bikes rock so does anything in the rear of the unit.
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Beware; the Heartland hitch option is unsafe and should be removed from the market. Heartland should seriously consider discontinuing this hitch and send a letter to customer's who purchase them explaining that it is unsafe to use for bicycle carriers. I had a welder beef up mine so I could safely carry bicycles.
My bike carrier manufacturer said the same thing. I asked the manufacturer why they have that precaution and they replied that the low frequency side to side movement of trailers causes the hitch metal to crystallize causing it break away. They told me that if I want to use a bike carrier to use another brand-- but not theirs because of safety liability that they did not want to assume. I gave this information to my local welder and he added the necessary bracing to eliminate that concern..... But he would not guarantee it that the carrier would not break. I added a safety strap in the unlikely event that should happen. I now have less vibration on the carrier than when it is directly mounted on the truck hitch. If I was Heartland I would definitely stop using this flimsy hitch and warn customer who already have one.Plus, read the small print on your bike rack paperwork. I was surprised to find mine says "not to be used on the back of trailers or RV's".
After seeing that, this must be a common problem. Trace
In general standard hitch-mount bike carriers cannot be used on RVs and 5th wheels because of the extreme lateral and vertical forces found at the rear of such vehicles. The further the back of the trailer is from the rear axle the more lateral sway and vertical bounce there will be. (Think of a whip, where the tip moves much faster and farther than the handle end; or of the bumpy ride quality in the back of a school bus.) These forces will be far greater than what is encountered typically at the rear of an automobile due to the longer distance from rear axle to the rack and so many bike rack makers will not honor the product warranty if used on the back of a motor home or 5th wheel.
The Swagman XTC-2 - 2 Bike Platform Carrier you referenced, part # S64670, in its instructions (attached) warns against use on 5th wheels due to both the excessive movement that can damage the carrier and the potential for damage to the hitch.
However, we do offer the Rola NV2 hitch-mount hanging-style carrier, part # 59508, that is approved for use on the back of a 5th wheel. I confirmed this with my technical contact at Rola. This rack features a solid 1-1/4-inch shank and offers a 100-lb capacity. Again, you will want to check your owners manual or consult with your Cedar Creek dealer for the weight capacity of their bike rack hitch to ensure that the total weight of the rack plus your bikes does not exceed the hitch rating
I found the below information on etrailer.com. Explains the reason why most hitch-mount bike carriers are not approved for 5th wheels. A bike manufacturer that does approve their product has a solid 1 1/4" shank.