The 2.530" tubing is specially made for smooth inside also; it might not be too bad to pay
$30 for a foot of it if you're only doing one or two, but in my case it made more sense to just buy a 20' stick - for one thing, my mag drill makes quick work of the pin holes, I've never needed the collar on the .250" wall tube, and
my price by the 20' stick is $6.80 per foot.
That let me have TWENTY 12" long pieces (even more if they're SHORTER) for less than FIVE of the Etrailer ready-mades...
Guess it depends on how crazy yer gonna get with it - pretty obvious what MY answer is, huh?
...Steve