[ChuckS]

for the OP.. Please DEFINE what you mean when you state the LG movement STOPS ..

IS the hydraulic pump still running when the actual movement of the front LG STOPS?

If so then your issue is not electrical

If however the pump does stop then since your RV is a 2015 then locate the OEM 50 amp resettable breaker that has the heavy cable running from right terminal pole on that breaker up to pump solenoid.. REPLACE that breaker with 80 amp one.