I would fuse the cable from the battery to the inverter as close to the battery as possible. The fuse is there to protect the wire from overheating and causing a fire. If for some reason the insulation were to be destroyed and it short to ground, there would be a lot of energy discharged. I. try and keep it within 8" of of the positive terminal. The fuse in the inverter is not adequate.
The coffee maker can draw 5 to 8 amps. It should be marked on the case. That can be significant current. But what if your wife plugs in a hair dryer? Now we are at 15 amps plus whatever else is on....!!.
Be sure and study tinglett's excellent thread. Wiring size is discussed, both in the trailer and the supply from the tow vehicle. In this case, a battery to battery charger is not necessary or perhaps desirable. There are two functions of a battery to battery charger. One is the correct charging profile (voltage, current and duration) plus the protection of the TV alternator.
A concern is that if you do not fully charge the battery that you will not be getting the full benefit from your purchase. You are buying first class equipment.
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Bob Austin--celebrating 60 years of RVing
2013 Via 25T
Pensacola, FL
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