I got the curt 1.25” hitch for the xb:
http://m.autoanything.com/towing/73A3874A0A0.aspx
But then had a local fab shop weld on 2” receivers on either side, with reinforcing gussets tied into the side supports. The design of the hitch was well suited for this customization. I can try and take some closeup pics if you wanna take them to a welder.
For the carrier I bought 7 feet of 2” aluminum tube stock (1/4” thick) and riveted the carrier to the tubes. I didn’t bother at all with the standard supports that came with the carrier.
You can see the smaller middle receiver in the second pic:
