I more or less completely agree with
@smurfslayer
I spent about $5000 in stuff to just be able to off road safely, before any mods. In addition to what
@smurfslayer said:
* Rack for in-bed spare
* Extra spare tire
* Lowrance or other off-road GPS
* VHF radio
I personally run a CO2 tank instead of compressor, but either way you need something bigger than a tankless, cigarette lighter inflator.
First mod I did to the actual truck was a bumper designed for having the frame horns cut, ie. RPG Raceline. That was after smashing three factory skid plates. My RPG looks great 5 years later.
A rear facing dust light is also nice. I got a couple Rigid D2's with amber covers after following people with and without them. I knew I never again wanted to be the person someone was following that didn't have them.
Lighting is always an easy mod if you plan to run at night. It can get expensive though, so I wouldn't start there unless you really know you are doing night runs.
To
@smurfslayer 's point though, nothing I've mentioned is about upping power or suspension. The added expense in gear was something I didn't really foresee when buying a Raptor.