I use Aere
inflatable fenders traveling through Canadian and American locks, rough walls and pillings. Call Aere customer
service and ask about the proper size and the proper spacing. Normally fenders explode if too few are used or, too small in size, or exposed bolts or sharp muscle shells/barnacles are present. Aere inflatable fenders are found on many mega yachts and have been in business a long time which is a good testimony as to their
reliability.