Nice to meet you all!! This is a long one

Bought my first Bongo 3 weeks ago, chuffed to bits with it. Had a one night overnighter the day I got it in a car park in Stonehaven, and last weekend had 2 nights at the great Mintlaw Eden Country Park Site.
It is/will be used for mainly weekends away with myself and 2 kids (7&8y.o.) but will try to get a week or so touring around a few places this summer. Camp sites and when I am more confident in the current starting issues I have with it some wild camping.
It has a side conversion with back seats and box seats used as downstairs bed. I maybe just need to man up as the kids slept fine every night but I am not finding either beds very comfy at all. Any tips on making either bed more comfy. I found the box seat moved back during the night so there was a gap but can’t think of a handy way of fixing it in position for the bed set up. Upstairs the mattress is really thin, wondered if there were any options for beefing up the mat a bit. Any help appreciated on this topic.
Think we took far too much stuff for the weekend trip but guessing I am going to need extra storage. I can get stuff in the boot but then can’t use the fold away table. An alternative is to keep stuff in the front passenger seat but thinking an external luggage carrier thing might be required. Will give it a few more runs as is before taking the plunge but wondered what the options are. Roof mounted? Something off the back? Also need a good rack for our 3 bikes that is Bongo compatible.
Can anything be left in the roof sleeping (bedding flattened) before lowering roof?
Are there any good, (cheap!) slim bedding options on the market as our 3 sleeping bags seem to take up a heap of room?
TV/Radio - Don’t watch much but always good way of keeping kids still for a minute. Any good products on the market. Anything which could store movies on and be used with said "TV?"
On our fist night I stupidly flattened the leisure battery running the fridge. What is battery man enough for? How do the solar panels I have heard about improve things?
And a few random ones; I have a flip back bit behind the front passenger seat. What is this for ? Any good clothes drying options/lines? And any tips on cleaning the mildew from inside the tent bit of the roof?
Now I've typed this out thinking I should have posted them as separate threads...

Cheers
Colin