Equipment on Large Rescue Trailer (Semi-Pulled)

I would like to be able to add equipment to the Semi pulled Large Rescue Trailers. Right now, these units are okay for RP but often times you aren't able to get the functionality up to snuff with the IRL vehicles they imitate. Since a HRV is able to load 20 equipment units, I'd propose making these equivalent or making the large trailer have slightly more capacity at 30 or 40. Due to the limited equipment slots and the fact that these require a Semi Vehicle, this feels like a fair tradeoff gameplay wise to me.