Those appear to be the only fields related to cargo, so it looks like you've got that one right.Here is the code for the marksman replacement's cargo
<SpecialCargo>SPECIALUNIT_BIRD</SpecialCargo>
<DomainCargo>DOMAIN_AIR</DomainCargo>
<iCargo>1</iCargo>
As opposed to the hunter's
<SpecialCargo>SPECIALUNIT_BIRD</SpecialCargo>
<DomainCargo>DOMAIN_AIR</DomainCargo>
<iCargo>1</iCargo>
<FreePromotions>
<FreePromotion>
<PromotionType>PROMOTION_HERO</PromotionType>
<bFreePromotion>1</bFreePromotion>
</FreePromotion>
<FreePromotion>
<PromotionType>PROMOTION_SPIRIT_GUIDE</PromotionType>
<bFreePromotion>1</bFreePromotion>
</FreePromotion>
<FreePromotion>
<PromotionType>PROMOTION_COMMANDO</PromotionType>
<bFreePromotion>1</bFreePromotion>
</FreePromotion>
<FreePromotion>
<PromotionType>PROMOTION_SPIRIT2</PromotionType>
<bFreePromotion>1</bFreePromotion>
</FreePromotions>
yay I helped