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I've operated the jacks when the battery was too low to power them (also when picking up from the dealer) simply by plugging the trailer into the truck. I've operated jacks and slides with the battery removed using heavy duty jumper cables hooked to the RV battery terminals on one end and a fully charged battery on the other. I did that instead of installeing the battery to open the rig up before I installed a disconnect on the negative terminal. I have not hooked cables to the truck battery, but am sure it would work as I have the heavy duty alternator.
RV dealers routinely use charge packs to power rigs with no batteries to display them.
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