Mike,
PPL in TX carries the Barker VIP 3500.
https://www.pplmotorhomes.com/parts/towing-hitches-jacks-chassis/jacks-levelers/tongue-jacks-electric-manual/electric-tongue-jacks/vip-barker-jack_94-0115Not sure what stroke that model has. The word description sounds incorrect. A 6 x 6 wood block could solve your stroke problem. If they have it in their warehouse, the shipping distance is less or you may be close enough to go pick it up. Not sure where in TX you are.
That said, any Barker dealer out of stock may have them dropped shipped from Barker in MI.
Call PPL, I have bought from them in the past and they are good to work with from my transactions.
Hope this helps
John