I'm based in Leeds and thinking about a Bongo, so getting a bit of advice from local owners seems like a good idea. I'll apologise in advance for the novice questions

I'm looking to replace my everyday car, which I sometimes use for commuting but don't do big mileage in. One of my main uses would be towing a track car on a trailer (circa 1300kg total), also need good storage space for tools / wheels etc, and somewhere to sleep would be the big bonus.
I probably don't need a full camper conversion, so at the moment I'm thinking that a regular 8 seater with pop-up roof 4wd 2.5l diesel is probably the one to look for. This seems like the best option as I should be able to store all my stuff under the pax seats - maybe take some out it that's possible, and sleep in the roof space.
Does anyone have experience of towing something so heavy with a Bongo? Do they have enough grunt, and what's it like for stability? I understand that normal mpg would probably be 25-30, how low does this drop when towing?
How comfy are the front seats for long-distance driving?
Are there any significant downsides to the 4wd other than a bit more tyre wear?
Any good places for towbar fitting if the Bongo I choose doesn't already have one?
Looking at the local dealers, Elams of Mirfield seem to have a decent selection - any feedback (good or bad) about them, and any other recommended dealers in the area?
Sorry, questions probably came a bit thick and fast there. Any other comments / suggestions for a newbie would be greatly appreciated.
Cheers
Nigel