Hi and welcome! That MAY be a part that is specific to HiLos and, it MAY be specific to that model HiLo - it's certainly longer and narrower than the table in mine. I'd call J&R HiLo Repair in Ohio to see what they have or recommend. Here's a link to their webpage: Home - JR REPAIR
I suspect you could make a table that would fit or have one made if you are not "handy".
Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew