LoL Angel,
I have to say a bedliner and toolbox are must haves as far as I am concerned on a truck...
Rino liner is cool, but doesn't provide impact protection for the truck body the same way the plastic bedliners do... I don't know how tough you plan on being on it... but I would definitely have one or the other...
If your in the woods they make deer signals to scare deer off the road... I think they make the same for Moose... If your a hunter or a redneck a gun rack is useful/cool...
If you wanna go crazy you could throw some bigger tires or a lift kit... but more practically a wench is pretty useful, again if your in the country, I assume your not getting a truck for in the city after all... Warn makes decent priced wenches...
if your a fisherman you can get rod holders on the front, if you go through bushes you can get a bush bar... you can get a rack for luggage or ladders on top of the cab... you can get a bed cap or a bed cover and make it look like an SUV... its really all up to the money you want to spend and the practicality of when your likely to need it...