The jacks are
Lippert 285318. FWIW during my trailer build I was told by Linda Fedoruk at ETI that jack is currently used on the 5.0 and also as the tongue jack on all of their bumper pull models.
The Lippert downloadable Owners Manual, Installation Manual, and Service Manual all three reference the necessity of a 30A ATO fuse inline on the single-wire power connection. That fuse holder/fuse is shown as included inline on the power-wire pigtail on the jack as delivered from Lippert.
Note that in the 5.0 application the jack upper-cover with switches and light is removed / not used - the jacks being in an enclosed compartment are missing that cover assembly and 'wired direct' by ETI to the remotely-located switches in the small exterior compartment on the drivers-side of the trailer (that small compartment is also the location of the optional toilet shut-off valve). The back of the switch assembly is accessible in the drivers-side jack compartment, accessed by removing the end-panel in the propane compartment (a 'service access panel' which is held in place by screws and gasketed).
Yeah, I've removed every 'service access' panel in my 5.0 and have also removed the 'non-removable' (screwed/stapled and glued in place) panels backing the floor-level cabinets to access wire-runs over the wheel wells on both sides. The latter did result in damage to the thin 'maple' paneling (but not the framing); I have extra paneling delivered with my trailer to restore the damaged pieces. It's been an 'enlightening exploration' to say the least ;D.
And yes, I have been Having Fun every step of the way as I get to know and document my 5.0
intimately!
PS - attached is my latest electrical mods schematic, now incorporating a DC fuse sub-panel located in the front cargo compartment for the purpose of providing feed to the jacks and several other DC powered items at the front of the trailer.