We have had our bongo for nearly a year, got out a couple times last year, but not yet this year sadly

We have a side conversion installed when we bought her, but turns out it lacks a little, we could really do with install a fridge, that can either run off the leisure battery or mains. and also install some sockets and lighting to run off the leisure bat. Also would like a new head unit installed with car play and sat nav etc. The current leisure battery set up is largely useless it isn't currently working (not sure if it is just a knackered battery or the the split charger) the split charger looks pretty flimsy and cheap anyway and currently the leisure battery only runs the rather old DVD head unit.
I was planning on doing this work myself but a new job, and the fact that I would rather spend my weekends off having fun in her than fixing her up, I am looking for some advice on where I might get this all done, or any advice on the subject at all really.
Much appreciated,
Rich