The 10B21275KE part # MA39FR replaces the 10-21275KE you mentioned as well so if you had an older model number you could use it in same application. view full answer...
Generally speaking most wouldn't recommend installing a battery in the interior of a vehicle. A lot of batteries need to vent and you having it vent in the interior where you'd be riding when driving wouldn't be safe. Best option is using the # RM-9332 to power the Blue Ox Patriot # BLU37TR. view full answer...
Based on my research your 2015 Entegra Coach Cornerstone comes equipped with a narrow king sized mattress, and more specifically with a sleep number air design like you mentioned. To replace this I highly recommend the etrailer eDream Supreme RV Mattress # e77FR, which features cool and comfy gel memory foam that conforms to your body. It's also double sided, so you have the ability to flip between plush or firm sides depending on your preference, so you are guaranteed a great night's sleep... view full answer...