Though I don't have a Berkshire, I was camped all last week at the beach in Ventura beside a guy that sells these lights in Quartzite, and his Prevost was completely "decked out" with them!
His advice, that I will pass along, was to never use the adhesive that comes with these strip lights, and always replace it with the genuine 3M tape instead (if that's how you intend to mount them).
2004 Terry 250RKS, perfect for the two of us and the pups. It recently replaced our Flagstaff 21FB.
2000 F-350 7.3L CC/LB 4WD Lariat 3:73's