ntsqd
technerd
If the insertion depth of whatever is far enough into the receiver tube you may not need that reinforcing ring on the end. Those rings are usually either a short section of the next larger tube or are formed from strap steel.
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Either buy a premade tube with that reinforcement; or cut a strip, wrap, & weld it on. It's not on the website now, but my local NT has a 4~5' receiver tube for ~$40.
Towing Hitch Adapters | Northern Tool + Equipment
On my mini-trailer, I used 3" tube for the tongue because that's what the tongue fit onto. It also has plenty of room inside for the e-brake handles (which I haven't added yet, but the axle has the cables). I used a Dodge Caravan rear axle because of its drop design, simple suspension, shocks, brakes, & common rims.
Because of the large tube & light axle, it didn't need triangulation; and because there's no tongue box, it has a ~93° jackknife angle (before the tongue hits the tow vehicle bumper).
If the insertion depth of whatever is far enough into the receiver tube you may not need that reinforcing ring on the end. Those rings are usually either a short section of the next larger tube or are formed from strap steel.
2.5" inside square tube would be too loose, unless you fully-welded it. Most are just a ~0.5x0.25x10.25" strip wrapped around & tack-welded in a few spots.
^^^ they're right; it's only metal; once welded properly, they are once piece...I'm going to pick thru the scrap bin at the steel yard today to get some short stout strap, myself, I'll look to see if there is the tiniest piece of 3x3x.25 for you...
Yes it will be fully welded to the hitch tube as a gusset. I have never seen a hitch tube without one of these, but I don't know where or what to search for to find it. Well that is outside of buying 20 ft of it just for 0.5". Haha