@MEXICOWANADERER: Thank you for your response. I fall into the weekend warrior category as I am in Texas where 80% of camping requires the use of AC and pedestal power. It is only in the winter and mountain trips where boon docking is feasible for us.
@time2roll: I have plenty of height so no issue with the added inch.
@pianotuna: I don't think I am looking to add a converter but rather upgrade what I have. I understand the increased value of the converters you point out. Installing directly next to the battery has some serious value that I should ponder. One concern, it will be in a non-vented/non-cooled compartment that may cause heat buildup. The batteries will be in vented battery boxes and vent from bottom to top and out.
On second thought this may could go behind my current converter and be mounted to the floor but again no fresh air and possible heat build up.
@Cydog15: This is how I am leaning. I believe I should consider upgrading the 6AWG to match the 55A. Need to investigate the feasibility and difficulty of this.
@Crabbypatty: The Trojan T-125 would fit my battery box and are pretty impressive performance wise (240Ah). About twice the price of the Duracell GC2 @ 215Ah. hmmm........
@BFL15: I believe the adjustable voltage would allow some compensation for wiring R (V loss) which would be a good thing. It would also allow optimum voltage for each battery type (should they be changed). The issue is where to mount it....