Seems unlikely both slides would loose the motors at the same time ( guessing they're not hydraulic). Have you checked for voltage at the slide switch? Are the batteries charged? Disconnect for the battery in the engaged or "on" position? Do other 12 volt systems work? The tongue jack, awning if electric, lights, bathroom fan?
Check the battery voltage and check the positive wire leading from the battery. It should connect to a self resetting breaker usually mounted on the frame near the battery. As the trailer in your profile is 13 yrs old I'd look at that first.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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