I am planning to use pine tongue and groove paneling for my ceiling, but I think this would apply to any ceiling. I am able to attach nailer board to the ribs of the van but on the ends, in both the front and rear of the van. I don't want to drive screws through the roof. Is there an adhesive product anyone would recommend to glue the boards up? I don't think there would be much load on these end pieces as they will just be there to tie the ends down but I am not experienced with this sort of thing.