ERS is a set of different parts to build a rover which includes:
Command module with airlock which can store up to 4 kerbanauts Crew module , can store 4 kerbanauts Crew and Cargo module (NEW) Airlock and Cargo module (NEW) Cargo module (NEW) Universal Storage Mount preview: https://youtu.be/_TAkwehhk2M Service module with battery or Fuel Cell and fuel Wheels with tweakable mount (depending on which side it will be placed). They can be easily folded for transportation. Powerful folding LED spotlight Extendable Docking Port Javascript is disabled. View full album You can add/remove nodes with RCM (right-click-menu) in VAB.
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