I have only replaced my trailer light once in the 18 years that I have had this boat/trailer (one each side)...
But, it takes me a good 10-12 minutes to ready the boat, once I'm at the lake ( boat tiedowns, motor toter, DRAIN PLUG, squeeze the primer bulb, mount two graphs, turn on power to boat and trolling motor, plug in trolling motor, get rods , tackle and life jackets out of the lockers, unhook safety and winch straps, ..)
I stop far enough back from the launch ramp that I'm not in the way of people launching....