Ok now, after playing up to lvl27 with 15/15 I think I know how to continue. It will be a bit different from the original trashman with less possibilities so let me present:
The Garbageman
Level 30
15/18 (in order to get more wpf I need 6 WM)
Weapon Master: 6
Athletics: 6
Riding: 5
Iron Flesh:0
Shield: 5
Horse Archery: 2
Power Strike: 5
Power Draw: 5
Power Throw: 0
1 spare skill point to invest in either more shield or more riding for more unlocks on the battlefield! The additional wpf points can be invested in more melee or xbow points, alternatively you can invest skill points in throwing and go for 80 wpf in throwing.