Some of us do have two batteries, but not for that reason. Batteries are supplied by the dealers, not Keystone, so unless you specified anything special, you likely have a small battery. Extra battery capacity can be useful if you dry camp, or overnight without 120v power.
The larger fuse will likely solve your problem, but you might also make sure that your slide mechanism is properly lubricated, so that it is not putting an abnormal load on the hydraulic pump motor. It is not really necessary, but whenever possible, we try to have the shore power connected while operating the slides and legs. Two batteries might be a nice thing for you to have for other reasons, but I don't think that by itself would cure your slide problem.
Hope this helps, probably others will have some other suggestions as well.
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