If you restrict the size to 55 or 60AH it will be OK next the the ABS modulator, BUT if you have dual air it can't be done, you'll need to move the jack and turn the starter battery around and do 2 batteries side by side.
LIKE THIS
https://www.aulro.com/afvb/images/im...012/04/939.jpg
MINE IS LIKE THIS
https://www.aulro.com/afvb/
I took that battery out as it was too big and it was a lead acid battery DON'T USE A LEAD ACID BATTERY, get a AGM or GEL type one around 55 to 60AH if putting it here.
Go for 245/75/16 in the tyres they will fit with no lift, then when your ready, go for a 2 or 3" lift this can be done with off the shelf springs and shocks.
And your done:D
Baz.

