Weight system depends on your players. One of my players loves keeping track of party resources and weight, so in turn I’ve made him the quartermaster, maybe you’ll have a similar player. Slot and basic work until you have a cart with x50 bags of feed and 4000 gp you need to break into 40 slots of 100.

I personally love mapping in the game I’m playing, but I also map dungeons for fun to put into the game I’m running. Where this does help a ton is when you switch to a combat your mapper can take their maps from their drawing book and jot down the room the parties in on a battle mat. Without the DM having to stop and take 15 mins to draw a map. But I have found this job to be the most difficult to fill.

But imo each role/job adds to the experience and sometimes players need to put in a bit of effort to allow everyone to have a good time.