I just added 135 watts of solar power to my scamp, I could of mounted the panel long ways but did not like the way it stuck out at the front. The morningstar controller was mounted under the front bed for easy access to the wiring and an easy way to the battery.
I used a 115 watt panel with a group 27 battery and found the battery charged to 100% by 10:30 AM most mornings this past winter in Texas. We run LED lights
, a 15" LCD TV, AM/FM/CD, 12v water pump, furnace
, and once in awhile a 90 watt crock pot for 4 hrs/ day. The crock pot was started by 10 and off by 2(only on sunny days) so the panel could charge the battery before 5 PM. This summer I intend to double the battery capacity so we should be able to survive longer without sun(up to 3 days with the extra battery). A single group 24 battery would suffice if we didn't need the furnace
and got some sun each day. With your 135 watt panel and LED lights
you should be able to light
the entire neighborhood.