What makes a good Head Porter in CK3?

Employer has Local Inspection Perk +10, Employer has Positions Of Power Perk (Friend) +5, Martial Skill Martial × 2.5 (max 60), Stewardship Skill Stewardship (max 60) and Logistician +15 (the game's aptitude breakdown, patch 1.20.0.3).

What does the Head Porter give?

Terrible: Supply Capacity +5, Provisions Loss -2%; Poor: Supply Capacity +15, Provisions Loss -4%; Average: Supply Capacity +25, Provisions Loss -8%; Good: Supply Capacity +35, Provisions Loss -16%; Excellent: Supply Capacity +50, Provisions Loss -32%.

Camp officers (landless adventurers)

Head Porter

Roads to Power

Head Porter is a camp officer in Crusader Kings III; its aptitude rests on Martial. At excellent aptitude it gives Supply Capacity +50, Provisions Loss -32%. Aptitude also comes from Employer has Local Inspection Perk (+10), Employer has Positions Of Power Perk (Friend) (+5) and Logistician (+15). It needs Roads to Power. Patch 1.20.0.3, from game/common/court_positions/types/00_camp_officers.txt.

Quick answers (2)

What makes a good Head Porter in CK3?: Employer has Local Inspection Perk +10, Employer has Positions Of Power Perk (Friend) +5, Martial Skill Martial × 2.5 (max 60), Stewardship Skill Stewardship (max 60) and Logistician +15 (the game's aptitude breakdown, patch 1.20.0.3).
What does the Head Porter give?: Terrible: Supply Capacity +5, Provisions Loss -2%; Poor: Supply Capacity +15, Provisions Loss -4%; Average: Supply Capacity +25, Provisions Loss -8%; Good: Supply Capacity +35, Provisions Loss -16%; Excellent: Supply Capacity +50, Provisions Loss -32%.

The Head Porter is in charge of transporting the camp and all its provisions. They ensure everything arrives at the next destination in one piece.

What it gives you, by aptitude

The holder's aptitude (see below) sets the level: levels start at 20, 40, 60, 80.

Terriblebelow 20
- Supply Capacity+5
- Provisions Loss-2%
Poor20+
- Supply Capacity+15
- Provisions Loss-4%
Average40+
- Supply Capacity+25
- Provisions Loss-8%
Good60+
- Supply Capacity+35
- Provisions Loss-16%
Excellent80+
- Supply Capacity+50
- Provisions Loss-32%

What makes a good Head Porter

The game's own aptitude breakdown for this position — every part it adds up:

Part	Aptitude
Employer has Local Inspection Perk	+10
Employer has Positions Of Power Perk (Friend)	+5
Martial Skill	Martial × 2.5 (max 60)
Stewardship Skill	Stewardship (max 60)
Logistician	+15

The holder gets

Prestige+0.1/month

Who may hire it (valid_position) (13 lines of game script)

custom_tooltip = {
	text = landless_government_tt
	government_has_flag = government_is_landless_adventurer
}
OR = {
	custom_tooltip = {
		text = head_porter_camp_officer_parameter_tt
		domicile ?= {
			has_domicile_parameter = camp_unlocks_head_porter_officer
		}
	}
	has_perk = local_inspection_perk
}

As written in game/common/court_positions/types/00_camp_officers.txt.

Who may hold it (valid_character) (3 lines of game script)

valid_camp_officer_trigger = {
	OFFICER = head_porter
}

As written in game/common/court_positions/types/00_camp_officers.txt.

Shown when (is_shown) (5 lines of game script)

has_ep3_dlc_trigger = yes
custom_tooltip = {
	text = landless_government_tt
	government_has_flag = government_is_landless_adventurer
}

As written in game/common/court_positions/types/00_camp_officers.txt.

Source: game/common/court_positions/types/00_camp_officers.txt, common/court_positions/tasks, common/script_values and the English localisation, Crusader Kings III 1.20.0.3. Salary is the base before the realm-size and cultural-era multipliers.