Use a 30 Amp fuse on the +12V hot line. 20 Amps is too small if the refrigerator is using DC and the battery is being charged. Pull the plug before you raise the top, because the lifting motor can increase the current above 30 Amps if the refrigerator is on and the battery is a bit low.
You could use "bulb grease" on the contacts. I'm not sure how conductive anything else is. I don't think you need it though. Plugging and unplugging seems to keep things clean for me.
I can't help you with the couch problem, sorry.
- Jack
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Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan, LiFePO4 battery 12V DC Electrical System
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew
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