Came in late to this, but I repaired my van with Soudal Fix All. I've used Sikaflex too. Both work well. Repairs using Soudal include sticking insulation foam to outer skin, bonding ply to the foam inside, bonding wooden frame to both and sealing the rail which was totally removed from the offside of the van. Did this about 5 years ago and it's still holding firm.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets