在《钢铁雄心4》中，可以使用以下代码来增加特定类型的装备：
步兵武器
```
add_equipment 600000 infantry_equipment_3
```
现代坦克
```
add_equipment 10000 modern_tank_equipment_1
```
现代自行火炮
```
add_equipment 10000 modern_tank_artillery_equipment_1
```
现代自行防空车
```
add_equipment 10000 modern_tank_aa_equipment_1
```
摩托车
```
add_equipment 10000 motorized_equipment_1
```
拖拽式反坦克火炮
```
add_equipment 10000 anti_tank_equipment_3
```
防空火炮
```
add_equipment 10000 anti_air_equipment_3
```
机动火箭炮
```
add_equipment 10000 motorized_rocket_equipment_1
```
拖拽式火箭炮
```
add_equipment 10000 rocket_artillery_equipment_2
```
拖拽式火炮
```
add_equipment 10000 artillery_equipment_3
```
这些代码可以通过在游戏的控制台中输入来增加相应的装备。建议根据具体战况和需求选择合适的装备代码进行添加。