I have an old Ambulance that has been converted and is used by musicians and bands for tours, festivals etc. It is great, comfortable and very flexible. One of the bands (The View) artist (Ryan McPhail) gave it a dramatic spray paint job just to add to the package. It's ideal and I have had loads of offers for the van from within the industry however I cant seem to bring myself to part with it. This was a cheap conversion for me to do, I have also seen some Merc Sprinter Splitter Vans with ideal conversions suited for racetrack or musicians touring whilst on he circuit. Most of the bands who started out with the Ambulance now have huge tour buses but they still talk of their times spent in the Ambulance. You should have a look at an option like this however if you are solo then you may be better with a proper MH.
I also have a 1991 Elddis Autoquest 320, that I aquired by default. I bought this for a friend 2 years ago and he needed to sell it, due to health and financial issues, he is 73. so I bought It off him as it was too good a deal to turn down. I do not need it and my wife wants a newer model so it may be up for grabs if we decide to sell, I have been offered £7k as a trade in and the dealer has a near identicle one on his plot for £10500. This would not suit a full band although it is 4 berth, it would be ideal for solo or duet. It is also nippy enough to get into most venue carparks,I would have no problems at most of the smaller London venues like The Old Blue Last, Borderline, The Fly or Death Disco. So this size of van is ideal for a musician touring. Swivel cab seats, overhead double bed, shower and cassete toilet, kitchen with hob oven and grill, fridge, 2 singles or large double in lounge, plenty storage. Dependant on equipment I would use the overhead bed as storage rather than sleeping in this sort of van. I may not sell this one but something like this may be what you are looking for, if I were you I would not be tempted by the huge expensive vans if it is mainly for use on the music circuit.
You can mail me on [email protected]
if you want me to send some pic's of either van, it may help you in your search for a suitable musicians work/play compromise.