Richard, if you intend to use anything in a receiver that's heavier than you're comfortable with, here's something that's helped me - I have a receiver mounted vise that weighs around 90 pounds, and this one little mod makes a WORLD of difference in lining things up the FIRST time -
Typical "store-bought" receivers have a band around the outside of the hole, so I buy actual "receiver tube" at my steel supplier - it's 2.53" OD, and 2.03" ID so 2" square tube fits inside.
The little "notch" on the top lets you
rest the end of the insert on the first part of the receiver, and THEN line up to push it in. (pic is pretty high-res, click again for closeup of tube end)
At my age, that one little change makes the difference between attaching the vise AND doing the job, versus taking a NAP in between

...Steve