How much are they?
g503 has a 1/4 ton military trailer forum.
Check for rust and if all else is equal, take the one with the brake. Rust is the make or break item to look for on these trailers. Both have the lunette and landing leg, so whichever one is in better shape as far as rust and dents go is the one to get. If they are about the same as far as rust and dents go, get the one with the brake mech on it.
Might want to see if one has better tires on it too.
85 CJ7 258, borla header, Team Rush, MC2100 ,optima batt, Warn 8274, agr super box 2 & pump, T5 w/ B&M shifter, centerforce 2, superior 1 piece axles, warn hubs 2.5 in lift, 31" BFG MT
85 CJ7 258, A/C, T176, MC2100, Team Rush, Warn XD8000i, superwinch hubs, 3in lift 31" BFG AT/KO