If you remove the hydraulic surge you can still use the parking brake.
The below info is if you are wanting to get rid of the surge brake assembly because you don't want the pintle ring. As you are legally required by your state to have trailer brakes, I can't recommend removing them or disabling them.
95% certain it's a Dexter Marine model 6 surge brake assembly. Only real difference is the military uses a cast housing, where the civilian version uses sheet steel.
parts breakdown
Croft Trailer Supply is your One-Stop Trailer Shop. Buy trailers, parts and accessories, or have your trailer serviced or repaired by the best in the industry.
www.crofttrailer.com
Over at Croft Trailer Supply they have different inner slides you can install, such as the adjustable height one (not listed on the above parts breakdown)
Croft Trailer Supply is your One-Stop Trailer Shop. Buy trailers, parts and accessories, or have your trailer serviced or repaired by the best in the industry.
www.crofttrailer.com
Then you buy the hitch of your choice, whether it's a pintle ring or a ball type.
for 2" ball I believe this one will work (same channel diameter, but I don't know enough about them to know if it's an industry standard hole spacing)
Croft Trailer Supply is your One-Stop Trailer Shop. Buy trailers, parts and accessories, or have your trailer serviced or repaired by the best in the industry.
www.crofttrailer.com
I've read many comments in the past about Croft being helpful, so if you're interested in going this route maybe give them a call.