Breaking Down the Primary Mover 12K Hydraulic Jack Install
Hydraulic trailer jacks are becoming more common on heavy-duty trailer setups, but one of the biggest questions people still have is:
“What actually comes in the kit — and what does installation look like?”
We put together a quick walkthrough video showing the components included with the Primary Mover 12K Hydraulic Trailer Jack Kit, along with an install overview for both weld-on and bolt-on setups.
Watch the video here:
FAQ: Hydraulic Trailer Jack Kit Breakdown
“What comes in the kit?”
The Primary Mover 12K Hydraulic Trailer Jack Kit includes:
- The hydraulic jack leg
- Primary Mover double-acting hydraulic power unit
- 15-foot remote pendant
- Hydraulic hoses and fittings
- Grade 8 hardware
- Battery cables and battery strap
The goal is to provide the major components needed for a complete hydraulic jack setup rather than piecing everything together separately.
“What’s the difference between weld-on and bolt-on?”
The system supports both installation styles.
Weld-On
Typically preferred for:
- Permanent setups
- Fabricated trailer builds
- Maximum rigidity
Bolt-On
Often chosen for:
- Easier installation
- Existing trailer retrofits
- Users wanting less fabrication work
The video gives a good visual comparison of how the mounting setup works in real-world applications.
“Why use a double-acting hydraulic system?”
A double-acting hydraulic jack provides powered movement in both directions:
- Power up
- Power down
That means you get more controlled lowering compared to gravity-down systems, especially helpful with heavy tongue weights or uneven terrain.
“What are the counterbalance valves for?”
The dual counterbalance valves help prevent drift or unintended movement by hydraulically locking the jack in position.
That becomes important during:
- Loading
- Unloading
- Parking
- Transport
“Can this be used on different trailer types?”
Yes — the 12K capacity makes it a good fit for many:
- Equipment trailers
- Car haulers
- Dump trailers
- Enclosed trailers
- Heavy-duty custom builds
As always, mounting dimensions and trailer structure should be verified before installation.
“Are longer hoses available?”
Standard kits include two 72" hydraulic hoses, but longer 120" hose options are available for trailers needing additional routing flexibility.
“What’s one thing people underestimate about hydraulic jacks?”
Most people focus on lifting power — but after upgrading, many users end up appreciating:
- Faster setup time
- Less physical effort
- Better control during hookup
- More stability under load
It’s one of those upgrades that tends to make trailer use noticeably easier day-to-day.
To order, and for more info on the kit, click here.