Yeah done it with 2 Optima's. Pulled one out though as i needed it for my Willys temporarily. I didn't put it back in as i wasn't happy with the quality of the tray i made & want to re-make it.
V8 battery tray is smaller than the diesel's & it could be that 2 optimas will fit on a diesel tray
Can you measure your tray and let us know the size ?
V8 tray needs to be about 1.5" wider and 2" lower to allow for the front-most battery v's slope of the bonnet. Also, i needed to turn the fuse box 90deg to make room.
Been thinking about getting back to work onto this. Will see how i go in the next few weeks. Will take pics & let you know how i go.