Are you asking about the chassis starting batteries or the house batteries? The early Tiffins did not come with a way to charge the chassis batteries while on shore power. A trickle charger was added in later models.
2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing