Would you purchase a used hitch? Good or bad idea?

I'm upgrading my B&W companion hitch for my new tow. Heavier trailer requires it. New truck did not come with the puck system so installing the turnball but with the aluminum bed my old hitch won't work. I was hoping to sell it but found out the upper unit is useable but not the base so I'm only getting a new base. I didn't know these could be purchased separately till I talked to B&W. Otherwise there would be another 18k companion hitch for sale.