what i did with my yakima rack is i used some duck tape and wrapped the hitch a couple times and it solved the wobble...not the best thing but it worked

 

Here is the perfect fix (you had the right idea in the 5th picture!):




It's hard to see but the extension is bolted to the hitch receiver. I welded a 13/16 nut on the inside of the extension (one side only, preferably passenger side for easier access). Next, screw a 9/16x1.75" bolt (with washer & lock washer) through the stock receiver into the extension to the welded nut. I used this size because it was the biggest I could get through the hole. It'll tighten up to where you'll have no movement in the extension at all. Also I noticed your extension is huge, you can find them as small as 4" (recommended), it'll push the rack out just enough to clear your spare tire.

Note: this extension modification should NEVER be used for towing and ONLY be used for you bike rack.

 

TeraFlex 4" Long Arm Suspension System
TeraFlex Speed Bumps
TeraFlex Sleeve and Gusset
TeraFlex Front and Rear Differential Covers
TeraFlex Hinged Tire Carrier
37” BF Goodie KM2 Tires
17” Ballistic Jester Wheels
Fox Shocks
Fox Front Stealing Stabilizer Shock
5.13 Gearing - Front and Rear
Ball Joint Swap
Wheel Spacers
Locking Lug Nuts


Before


After (Warning: Poser Shot)

 

This will do the trick and for cheap - Amazon.com: StowAway Hitch Tightener: Automotive I have two - one for the extender and one for the bike rack. You may need one or two depending on how well the bike rack fits into the receiver/extender. We have a Soft Ride bike rack and it may be more or less snug than yours.

 

That is taking shape nicely!

 

Thanks! I'll look into that.

 

Pics of build...

 

More pics of the build...

 

Here some pics of the GF and I putting on the TF tire carrier.

 

Did you mean to say, "Here's a photo of my girlfriend putting the carrier and tire on while I'm sitting back drinking a beer, taking the photo and watching her do all the work"? Well played sir.