Sliding Bridge Jack recommendations

I have an Eagle 4 post lift, with one manual sliding bridge jack, and need to get a second in prep for the HDK project coming. As I understand it, I need to stick with a "sliding" bridge jack, I cannot use a "rolling " bridge jack.

With that said, I was looking for a sliding bridge jack good for 4k lbs, and with an air pump. I have searched everywhere for one, and only found one place (complete hydraulic) which would offer one. I'm hesitant to buy there because their site says they take credit cards, but when I talked with them, they stated e-check - and my gut just says it's shaky. Some other rds flags as well, too much to go into here, but point is I don't want to use them.

Most other Mfgs only do rolling jacks, so i was hoping that someone here might know of a mfg or shop which carries what I'm looking for.

Thanks in advance.......

The slider is for 3500 lbs - why cant you use a roller?
Atlas® RJ-35 Sliding Hydraulic Center Jack 3500 Lbs.| GSES | GSES

The tracks n my lift are not set up to use rollers, com firmed by the mfg as well.

I built a sliding jack table for my hoist,heavy c channel to cross and 3x3 heavy angle on the ends.
Angles form a z and channel sits on the angles. Bolted and welded.
I bought 2 air/hydraulic bottle jacks and it will lift anything my hoist will.