Realistically I'd probably travel light. Two guns at most, though more likely just one. Wasteland tells me ammo is scarce-ish, so semi and full autos are right out because I just know my ass would magdump. Definitely always a pump-action shotgun, there's enough variety in shells to where I could keep a couple different types. Not too many, though, since ammo weight and storage space adds up when it's just me alone. Potentially also a handgun for close quarters, if I thought I could spare the space for ammo. Ammo and speedloaders, since I'd be going for a revolver. The shotgun I'd prefer to be a trench gun, only one port means easier and less frequently needed cleaning.