This Purple Line Kojack RV Jacking Kit 150 mm Extension Piece is straight-up handy gear for anyone running a Kojack hydraulic jack on a taller van. It bumps your maximum lift from 600 mm to 750 mm, so you can tackle higher chassis and uneven sites without stacking random blocks. Slip it into the existing Kojack setup and you get an extra 150 mm of reach when swapping tyres or checking bearings.

The extension is built to match the Kojack system specs, so the jack keeps its rated capacity at the new 750 mm lift height. The fixed 150 mm length keeps things simple, with no threads or moving parts to fuss over in the dirt. It works as part of the standard Kojack RV kit, slots into your storage with the rest of the gear, and is a smart buy if your drawbar or chassis sits higher than about 600 mm.

• Suits Purple Line Kojack hydraulic RV jack kits

• Fixed extension length of 150 mm

• Increases maximum lift height from 600 mm to 750 mm

• Helpful for high-chassis caravans and RVs

• Reduces reliance on stacked packing blocks

• Solid one-piece extension for vertical load transfer

• Simple integration with existing Kojack jack interface

• Compact accessory that stores with your Kojack kit

• Intended for use on firm level jacking surfaces

• Genuine Kojack accessory for matched system performance

Q: Does this extension piece work on its own without a Kojack hydraulic RV jack kit?

No, this extension is made to be used only with a compatible Kojack hydraulic RV jack kit. It relies on the Kojack jack body for all lifting force and simply adds 150 mm of extra height. On its own it cannot raise a caravan or RV and should always be used as part of the complete Kojack setup. Using it with other jacks is not recommended.

Q: How much extra lift height does this extension actually add to my Kojack jack?

The extension adds a fixed 150 mm of extra reach to the jack. A standard Kojack hydraulic RV jack has a maximum lift height of about 600 mm. With this extension installed the new maximum lift height becomes roughly 750 mm. This extra length helps where the chassis or jacking point sits higher due to tyre size or suspension setup.

Q: Will this extension change the rated lifting capacity of my Kojack hydraulic RV jack?

The extension is specified as a matching Kojack accessory and is intended to work within the original jack capacity. It simply shifts the working height from a maximum of about 600 mm up to around 750 mm. The jack must still be used on firm level ground within its original load rating. Always follow the Kojack kit instructions and your caravan manufacturer’s jacking guidance.

Q: When should I choose the 150 mm extension instead of using packing blocks under the jack?

The 150 mm extension is useful when your RV or caravan often needs more than about 100–150 mm of extra height at the jacking point. A solid extension keeps the contact point aligned with the Kojack head instead of relying on multiple layers of timber blocks. This can help maintain a more stable lifting setup on firm surfaces. You can still use modest packing under the jack foot if required.

• Suits Kojack hydraulic RV jack kit only

• Increases jack maximum lift range from 600 mm to 750 mm

• Intended for RV and caravan applications that already use a Kojack hydraulic jack

• Used where extra 150 mm of lift height is required for safe jacking setup