Yep they can be used straight out of the box (well my meade was) except for batteries. IMHO there are one of two groups of accessories that I think would be an essential. (These are the Meade ones, Celestron would have equivalent)
either
1. A twelve volt jumpstart powerpack (min 15-18 amp) and a meade #607 power cord (for LXs up to 14") with cigarette lighter plug to plug into jumpstart pack. Even though the Meade manual says that the batteries you install in the fork arm will last 20 hours, it will depend on how much slewing you do. And you will do a lot initially
driving all over the place. (my preferred if mobility to other unpowered sites is important)
or
2. The power cord and a 240 volt to regulated 12 volt adapter to run off the mains.
Either way you will then be independant of the smaller multiple batteries in the fork arm.