Just wanted to post this information.
The Dexter Xr-84X couplers are coming on most new boats. The 2.5" standard coupler locks won't work since the unit is wider.
Seacured Fishing has the DeadBolt Locks with a spacer to work on these. BBC Sponsor
They carry the 2.5" lock as well for the older Couplers too.
Check it out at: https://seacuredfishing.com/trailer-coupler-lock
$25.95 with free shipping.