2 golf cart batteries should go really long way, especially if you have LED lights and don't use that power for TV or computers.
Than once you hook up truck to the trailer, the 30 amp charge wire should supply enough power for slide and lift the trailer with electric jacks.
Lately we camp with camper and the truck plug will power all 4 jacks simultaneously lifting 5000 lb camper.
Than if you leave the truck engine running with hookup for few minutes, it should recharge RV batteries to some %.
Still good idea to carry jump cables.
Lastly I would advise to buy one of those $90 generators from Harbor Freight as backup.
That thing will run our coffee maker and microwave as well.
One more thing to consider is disconnecting power cable on truck battery if you are not restarting it for few days.
The cabin light used each time you want to get something will add to parasitic discharge.