What about Guardian weapons anything worth getting there .. are they lighter or heavier don't want to loose jump range?I would keep the large 3C beams on top for sites with Sentinels in case you want to shoot at them from the ship versus the SRV. Add two medium 2B advanced missile racks on the bottom. They offer 16 more missiles each (total 64) than the standard missile racks with no increase in mass.
One would think that a powerful single missile would take out a ground scavenger but not always in ED! Two missiles do the job and can take out multiple targets if they are close enough. Mounting fixed missiles close to the centerline of a ship provides better targeting firing two at once versus on the wings.
On the ground I go with a Scarab for accurate targeting and an engineered Dominator suit with Manticore or L-6 rocket launcher weapons. Others like fast swapping thermal/kinetic weapons for more immersion.
Smaller lower cost ships can be configured for this game play keeping your Phantom for other uses. Here is a maxed out Cobra I use for on foot high conflict zones which easily takes care of threat 3 wreckage sites. Missiles don't require WEP pips so 4 pips to SYS keeps your shields up longer.
Regards
Cheers CC