i agree,caravans are no good for furniture, but some people like the doors . the real advantage is the stuff !
one or two rooflights
1 or 2 windows
foam bedset
hob oven sink water pump
water heater pipe taps
240/12v fuse boards,lights,wire switches
cassette toilet, basin,shower tray taps, shower head
handles hinges screws bolts catches
fridge and vent kit
tables and legs
gas bottles copper/flexi pipe compression joints and gastaps
curtain track and awning rail
ally sheet from the van's skin
that's thousands of pounds worth