Go to any of the online RV parts places. Among the ones I have used are
pplmotorhomes.com
etrailer.com
dyersonline.com
and of course Amazon.com
Did you check the Liftco site? BTW, Liftco jacks appear with a number of different names, and I have not found a cross-reference.
TM has always used jacks with 5000 pound lift capacity. Previously they had (I think) 18 or 20 inch lift range - today they have 24-inch lift. Either one will do fine. You will have your choice of hook-crank style or hex-nut-crank style. Again, both are fine. As you have noted, any jack that matches the top attachment plate will do well for you.
Bill
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