I don't own a Berk so I can't help you on determining replacement cost but if the crack is less than 3 or 4 inches you might be able to have it repaired. You might try calling Safelite at 877-664-8931. I don't work for Safelite but I'm in the car wash business and we do a pretty good bit of windshield chip repairs. If your insurance company participates in the Safelite glass repair network, which most major companies do, the repair is done at no out of pocket expense to you. They also do mobile repairs, just not sure if they do RV's. Worth a shot.
Kevin & Janine
2006 Dodge 2500 Megacab CTD 2WD
2012 Palomino Sabre 32RCTS
Pullrite Superglide 16K Hitch