Looking at the photos, it appears that the batteries are Marine batteries, not true deep cycle. There is a reference to SRM-24 on the battery that indicates that the battery is a group 24 (Interstate web site). Per wa8yxm, a grp 24 deep cycle battery would be good for 75AH.
Seems this battery bank is pretty small to power a 1000 w inverter, especially if they have been only trickle charged for a couple of hours.
The RV should charge the batteries when the RV is plugged in. Check the battery voltage when the RV is plugged in. Depending on your converter the battery voltage should be 13.6v or greater when charging the batteries.