If shoes and drums are smooth them I would leave them for now. Bear in mind that you will need to order new drums when you do brakes...very few shops even turn brake drums anymore, and I was not able to find ANY that would do a trailer drum because the inside face where the magnet rides needs to be turned too.
Last time I did brakes on the TT I got the 4 brake assemblies, new bearings, new seals, and new drums from etrailer for about $500 delivered.
ALSO: be sure you get self-adjusting assemblies, upgrade from that post-WWII technology where you have to adjust the brakes manually with a brake tool.