7.3 is still electric. If your wanting to put hydraulic jacks that would require the jacks, lines, pump/reservoir and wiring.
I would contact Bal about upgrading to 7.1 or 7.3, they could tell you what components of the 5.1 would still be used in the 7.X system.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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