I would use sufficient wood blocking and 20 ton bottle jacks under both sides of the main trailer frame just behind where the kick up is. One jack on each side. Raise the first jack under the frame rail and support the undamaged side first. Then raise the jack under the frame rail on the damaged side jacking that side up level with the other side. Then jack both sides together evenly raising the camper evenly to hook up to the tow vehicle. The camper would have to be supported as such to make repairs to the damaged leg any way.