i have a loverly little digitrex 19" widescreen 720p hd, built in freeview and dvd, usb , sdcard and pc input for £120. its wall mounted off the wadrobe side with a very nice removable dovetaile tilt and swivel mount. http://cgi.ebay.co.uk/LCD-TV-Wall-Mount-Bracket-Tilt-Swivel-17-19-20-22-L12-/390146685140?pt=UK_Home_Garden_LivingRoom_TV_Furniture&hash=item5ad68df8d4
This mount has a dovetail fitting that means the wall mount is fitted permanently to the van and the bit on the tv slides in out. You need to reinforce the wardrobe side but that quite a simple task, the tv comes off for travelling and when we are on site it does not take up any worktop space.
Great viewing angle even from below and the picture is very , very clear.
I use it with the status ariel in the van and also have a small , Bush HD FreeSat rx for the tims i cant get a digital or analogue signal.
As for spares, if you tv breaks down with 5 years then take it back you can get a repair as tv's are expected to last at least 7 years. I can honestly say that in my experience TVs are a lot more relaible than old CRT units and certainly more reliable than old valve driven crt units.
Extended warranties are a money making scam on the whole and most CABs and other "watchdog" typ progs rarely recommend them and certtainly not for the forst 12 months as its garunteed anyway.
happy hunting and have fun, you dont need to spend hundreds of pounds for little telly for your tourer.