The TJ220 ADJ TrestleJack is designed to work with wheel sizes ranging from 13 inch to 16 inch. With the capacity of 6 Tons, it can accommodate small to medium size trailers, RVs etc. The TrestleJack is a new lifting solution that makes replacing a tire simple, quick and safe. The TJ220 has 5 height adjustable positions, suiting a wide variety of trailer sizes. The jack supports both square and circular axles. With the videos and pictures, you will be able to identify if this jack is the right fit for you.