I don't think I'd let a front window stop me buying a camper I'm otherwise in love with. Unless there are already signs of rot around the window.
Buy it, take the window out and pre-emptively reseal it (properly, not like the factory probably did), and go camping.
Bigfoot 10.4E, 2015 F350 6.7L DRW 2WD, Autoflex Ultra Air Ride rear suspension, Hellwig Bigwig sway bars front and rear