2” is definitely better, but only if you have a 2” receiver.
If you have a 1.25” receiver, using an extender to stick a 2” in a 1.25” reciever completely defeats the purpose of having a 2” rack, and will be LESS stable than a 1.25” rack.
One nice thing about 1Up is that (at least on the standard rack) you can replace the 1-1/4” hitch piece with a 2” one down the road. That part is the only difference between the 1.25” and 2” versions of the basic rack.
Last edited by Kapusta; 08-01-22 at 08:17 AM.