... move long distance working in field. Features:1. Mobile (trailer) type, completely closed structure, waterproof, dustproof, move easy. ... absorber, braking system and steel welding of entire trailer guarantee 60km/h speed.3. Dealing with unqualified insulating ... fault, machine will be power off automatically. Advantages:Mobile (trailer) type, completely closed structure, waterproof, dustproof, it can ...