Split Relay Installation

Ive set up my delivery system and wondered if anyone locally to worcester area has experience of fitting a split relay charge to maintain power to the leisure battery?

The battery is housed in my delivery system and didnt want to keep removing and charging.

If anyone has experience and wants to help me out (for cash) i would be grateful. Or any contacts appreciated. Ive already purchased the split relay kit but cant seem to fit! 

Personally I didn’t have a split relay on my current van as I didn’t do enough mileage to keep it topped up, 

I use a 4amp smart charger that as SAE connectors they are great the connectors re permanently connected see link below

these are waterproof and very durable dropped it many times and as work perfect daily for the last three years. 

https://www.ebay.co.uk/itm/MAYPOLE-7423-Electronic-Car-Battery-Charger-3-8-A-Fast-Trickle-Pulse-Modes/121219067543?hash=item1c39382e97&enc=AQADAAADAFjVrDbVsZ8oH%2F8PNHtt9VX4%2Fw7FZcmMuqsX8uaFEduV6SRrozZGFFxlHLXO9CimAs1h4vCpVO0kC0skMJddnUSBNHbRhXfvHZKdluofubHK9RI8%2BYTSgCC1zYSCRPRnP1sq%2F%2BkApjQ%2FKClcyDiCB26MusWyjpUhj7fqftqhbxQ%2Bxxw9HS3QK35kbUc7UTB92OoNpbOOmxbPzk7APeLwWq2lAO3F6Y%2FQVN256q9it3ffCb75Br1nd84P5sKKgFymlXF5CbjPYd3CFh%2FtJ6k6JRbyOCpzWoX3w1kXTBRWnll2LwcP9I%2F7eBIzlFAemSqXgvslR9ZsXhIddogkT%2FIIUMtOD7Ojl1V%2Fb8Z904YuMD8LDGKr9nmt9XLpDDTpNQjzDHGuTabWKTtb7Ze4f5QZqs2%2FZFO57wOGM08Y2GBvY%2B8qpV2JdwBcVuXaratHgROp6Mib90dBvWXuy4hFeanGeEy4SkmkSOqChDkDTzMzLLO8pWijTe79OHyVjxdPvrDMEMe3tmXNX4MbcCDqqwIjtpuU2boUmswIEUvxbAwkCHHs9hSjeeFZhdm2h0ChB27DZH5Qwdl8iK4Hlipgsoh6pVGnifZM2IlGDyD1MoJ8mtsVeivo1E9LPpLBVmz0U6mgOP5aOjp%2B9b%2B3sN5QgceiOfBWR2PLZbnFg6oy7%2Fj2KraFuJy5z7cMCQ1FYoUind%2B%2FQl6wLU1ZOnYlnNwIzX6ote%2FCyMyR7WpK2LfWgqYE6BVysM%2Fn%2Ft3QODaYpLe2UcQJc3D1qFtJmO1V%2F1TDju2gi4TUMueLhdn0Ls0PRpf13AXaxilv7O3P%2BhDdyC4R0d4gWJxqRjcKpFR10tzo35tny%2FsjinJEy1opSC8RTljLAahxexRtUXm2jpRlzkmZZN5tBxQvmTL4kGSqPyfRkDyoVXpgCH4KfITXStNDT69WfcmKYXpg95gSIylqq1RlmPMcQHh%2FRtxsW5GbArUUcNhHPjWanBiVas14fOMG8bVHqQLTtfXQ6hDmwG0%2Bv6PPww4N1w%3D%3D&checksum=121219067543df945f2ce5204ad3a8746830920e56ba

Thanks Den..funnily enough i looked at this online..how is it permanently connected? Is it wired to main battery through the van or just off a mains adaptor via cigarette lighter?

The terminals are permanently connected to my liesure battery which is also concealed I then running extension lead and charger  on drive to charge up.

See photo of cable cable connector below. 

Makes sense..thanks so much...lots of ideas now..does your leisure battery last each day?.guessing your charging every night ...

Yes lasts-easy all day  it’s a 120ah two pumps and two HD electric reels I do charged each night.