Assuming you are powering a single circuit in the RV - the one supporting the TV hopefully has an extra outlet on it... - it is a relatively simple install. Can't help with suggestions on who to use in your area though.
Oneilkeys provided some very good info to review to be sure you will be happy with the installation and what it will or will not be able to provide...
You did indicate what you wanted to run (need watts for the specific coffee maker... they vary a lot) but not for how long you want to run it... Makes a big difference in size and number of batteries you will need as explained in the attachments above.
For some items like fan and computer (if laptop), a 12v version would be more efficient than the inverter.. (a 12v fan, and 12v laptop power adapter)
Still is draw on battery... But eliminates inefficiency of converting DC to AC (and in case of laptop - back to DC again...)
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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