Home - Trailers - Skeletals - Slope Frame ISO Tank Skeletal Trailer Slope Frame ISO Tank Skeletal Trailer The Dennison Slope Frame ISO Tank Skeletal Trailer is ideal for the transportation of hazardous liquids. The anti-slip catwalk/Q grate provides additional safety, and the slope frame design ensures that the tank maintains a low centre of gravity. FEATURE AND BENEFIT SUMMARY Optional 4 or 8 lock version – Depends on the transportation of 20ft or 30ft ISO tanks Catwalk – safe anti-slip Q grate for use the driver when accessing the rear of the ISO tank ADR regs optional – for the transportation of hazardous liquids Slope frame design – keeps the centre of gravity of the tank ISO low for transportation of liquids Plastic hose tubes – to store uses safe and secure when not in use