Agreed. I think the larger group batteries only give you more amp hours, not so much CCA? My 340 had group 27's and I never had a problem. There's really no additional DC load in a 400 above what the 340 has. Two fridges...that's the bulk of it. Perhaps a few more lights but we should all have LED's at this point, a non-issue...
Yep, my 290 only had one fridge but we never worked two grp 27's very hard. We only spend a few nights on the hook a year and when we do I drop the main fridge (its the original) back down a little bit so it doesn't cycle constantly. I have all LED's now except the anchor light bulbs - do you guys happen to know what festoon size LED the anchor mast takes? I need to swap those out for sure