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I need a battery(s) and charger to go into the tongue box on my racecar trailer. I have no idea what size and/or brand for either.
I'll have a generator with me at the track, so recharging during a race weekend is doable. Would prefer not to have to recharge everyday, but can if needed.

Power usage will be...
- car stereo - I can't find power requirements for this, but it not super high powered. 20W RMS and 50W max. This will be played on low volume for most of the day.
- XM Onyx - 9-16 V DC, 500 mA (max). Will be on for most of the day.
- interior lights - 6 LEDs using 1.05A total. Will be on for say 8 hours a day.
- 12V fan - uses 2.5A. Will be on for 8 hours a day.
- additionally, there will be some 12v use from recharging iPhone and iPad as well as maybe an hour or two/day of 12v laptop use.

The gen (Honda 2000i) will be run at least once per day for coffee. So, I guess an hour or two of charging will happen regardless.

So, with that all said, can anyone advise? I am fully ignorant...

Thanks,
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