Another simple solution, if ya don't have time to build Gumpy's converter board is to take the bulbs you have now to NAPA and have them cross them with identical 24V bulbs and then you just switch bulbs for what ever your pulling it with ! FWIW
Of course a little bit easier way is to buy a set of portable tow lights and install 24V bulbs in them, and mount them on what ya tow'n. Whether it be boat, toad, trailer,
mother n law
, opps scratch that last one might get t=ya's in trouble!