Welcome to iRV2.
Sorry I missed replying when you first posted .
My toad requires the key be left on to avoid locking the steering wheel and I installed a battery disconnect , rated for 1,000 amps in the negative battery cable. The engine and trans, will be in learn mode , the engine may stall on first start up and the trans may shift rough for the first 10>15 miles of driving.
This will do no harm.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.