CTEK do a 'comfort' connector with larger M8 eyelet connectors and in line fuse to connect direct to battery terminals. Cost around £7.50 on Amazon. Just fitted one works a treat.
Like you I used one of the Ctek comfort cables and fed it out to the nearside rear bumper bracket where I clamped the socket using a bracket that I made from Delrin. I find the hook up so simple and the socket has a rubber blanking plug to protect it when not in use
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