Welcome to the forum.
Either would be better than none.
The choice might be dependent on your hitch mfr.. Some hitches have a larger plate than others. Ours recommended a 12". There might also be thickness spec's. to avoid high pin clearance / latching issues. That's probably rare though.
Have a pleasant trip, Congrats.
DRV Suites ES-38RSSA #9679
GM Denali 3500HD-Max 4x, CC, 8' DRW