Take it to Fleet Farm and fill w/no Ethanol fuel. They also sell Seafoam for $50/Gal (way cheaper than 16oz cans). If the battery is relatively fresh and strong you shouldn't need to remove it. I store my '37 Chevy w/carbureted Small block all winter on nothing more than a full charge.
Clean cables/connections, fresh battery, operational alternator. If you're really worried you could either get a solar charger to keep the battery topped off or just a regular charger on trickle assuming you have access to electricity wherever said suburban will reside.
