The AH count resets to zero when the Tri thinks batts are full unless you kill that. The Tri instructions explain if you are on solar you will want to. I did see the AH reset when amps went neg as it got too dark for solar to keep amps pos. Drove me nuts until I read that part in the instructions. (when all else fails, read the instructions)
The Trimetric does not use Peukert but it still comes fairly close within reasonable RV draws. We had a thread about that a while ago ISTR. I ran a test and Peukert capacity wasn't as bad as the tables show. Those are for taking the batt down to 10.5v, but we don't do that, so the batts have a chance to bounce back after a heavy draw and do ok on the next draw, so capacity doesn't get too far out of whack.