I think first you need to determine how much 120v power you want to use. Changing from 12v DC to 120v AC a 10:1 jump in volts, but also energy is lost when the inverter changes DC to AC. To power all outlets in your RV is a bit ambitious, you'd need a n awful lot of battery capacity. All those batteries would require long periods of generator time to recharge them.
Once you decide on real needs, buy an inverter that meets those demands plus a bit more. Also what 120v items you want to power helps determine if you want a pure sine wave (PSW) or a modified sine wave (MSW) inverter. PSW are more expensive watt for watt, but prices are coming down.
Mounting the inverter near the batteries is important, 12v DC weakens as it travels over distance much faster than 120v AC. The inverter also needs ventilation, they do generate heat during operation.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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