Outpost Buff Station
The outpost buff station would be an added interface at the tower where HRV spawns. from the tower the raider can activate optional boosts provided by the outpost owner
for the raider this could mean things like having an automatically recharging shield that absorbs a fatal blow every minute, refilling munitions over time, increased speed, or any number of other boosting effects.
The builder would then be given additional capacity to use on their base directly related to which buffs they have enabled at the station. for the challenge raider these boosts are optional and provide them with an outpost with more dangerous content at the same difficulty as always with the option to step up their power as they go.