Idea for Heavy Cav Commander:
In case the Pershing needs better repair and/or the current repair buff does not work out:
The Field defenses could be swapped out with the Urban assault kit. This way there would be proper benefit in having two REs on the field if one gets the grenade launcher.
However this change implies multiple other changes (less defensive to more offensive layout) that affects the whole commander just to "fix" the Pershing. So not sure overall, just a thought.
Another idea would be to give Rangers a "Rudimentary Repair" upgrade option similar to PZ Grens in German Infantry. Thematically this fits since the commander is built around Combined Arms. You could balance it by having it take up a weapon slot so you can't have triple zook rangers than can also repair your Pershing. Though you can't typically support too many rangers in a build so it might not bee too stronk.