Never seen anything like that. We had a Jayco bungalow and had a lot of room for the Battery and propane bottles. I know one thing when you do get the battery out I would modify where the battery sits so you don't have to go through this again.
2018 Jayco Jayfeather 27 RL, 2002 Ford excursion, v-10, 3:73 gears 4x4 mine. 2020 Buick Encore Hers, Retired Air Force, now Retired.