OP Summary: Regardless of what PD unit you have that 29' to the batteries will not allow "best" charging hence you need a good sized charger mounted next to the batteries. Charger size depends upon the battery capacity and for 2xGC2s a 40-50A charger would be good. The length of the AC wires is not a concern.
50-90% SOC dry camping is common but it may take extra time from 80 to 90% and a lot of extra gen time for "best" which is 100%. That's where a smaller solar setup can provide "best" charging by finishing where the gen leaves off.
