This is the setup i've been using now for a couple roams. It requires at least one more Gaurdian so that the two of you can cap transfer from each other.
Honestly, 3 would be ideal because if one of you go down somehow in a 2 man setup you are screwed.
Anyway here it is... there are tons of options for the lows, I decided to go for a plate because I have seen a few non-plated Guardians go down. That extra buffer is worth it so that your m8's can get their reps on you (IMHО).
[Guardian, non-faction]
800mm Rеinforced Rolled Tungsten Plates I
N-Type EM Hardener I
Reactor Control Unit II
N-Type Thermic Hardener I
Pseudoelectron Containment Field I
Y-T8 Overcharged Hydrocarbon I Microwarpdrive
Conjunctive Radar ECCM Scanning Array I
Large 'Solace' I Remote Bulwark Reconstruction
Large 'Solace' I Remote Bulwark Reconstruction
Large 'Solace' I Remote Bulwark Reconstruction
Large 'Solace' I Remote Bulwark Reconstruction
Large 'Regard' I Power Projector
Large 'Regard' I Power Projector
Anti-Thermic Pump I
Anti-Kinetic Pump I
I've been thinking about droping the MWD in place of an AF as I just haven't needed the MWD in large RRBS gangs. Replacing the MWD for an Afterburner would really help the tank resists.
Don't forget a set of warrior II's so that you can at least get on 1 out of 50 killmails