2015 Keystone RV Alpine 3720FB, BATH AND 1/2 FLOOR PLAN. 2015 Keystone RV Alpine 3720FB is here. Sitting around the fire with friends and other couples and suddenly one of your guests asks to use the bathroom . Do not let them go through your private bedroom to use the bath, Send them to the guest bath you have in your Alpine 3720FB. As always loaded with the good stuff , the Alpine stands tall above the rest. Please call and let one of our sales professionals explain why Alpine and not the others.
