So many people go off and buy a roof rack without having the slightest idea of why except they think they need to or it's cool. In reality it's one of the least useful things unless you know exactly what it's for.
No roof tent requires a full rack, only cross bars are needed and most items you see up there just don't need to be or are better lower for weight reasons such as tires (really dumb esp if 90lb E load range oversized AT's), high-lifts, etc.
People just seem to go bananas for racks though yet still haul ice in coolers, drain their only battery, use crappy tires and/or 20" wheels, and have no way of addressing CEL, and other issues.
1st's -if actually going out to day-play: super basic recovery items like a shovel and traction device that is a multi-purpose design, not just whimpy/squishy tracks but actual bridging ladders (a rigid structure has at least the following uses: traction in mud,sand, snow, etc; bridging gaps, ramping up/down ledges, but also as blocking under tires to level a vehicle on odd terrain for camping, a standing platform on the rood negating need for a rack to stand on to take photos, etc; rigid traction devices can also be used as a jacking platform in soft surfaces for tire changes, etc. Put these on two saw horses and you have a table for cooking on! ...there are probably even more creative uses
The flexible ones like Maxtrax basically do only one thing while also being limited in their vehicle mounting options....
1st's -if going more camping, then fridge, possibly before tires or anything but IMO ..... this also requires a 2nd battery unless you like asking for a jump start.
*a lot of new lr3 owners don't realize that a full size spare was not a standard feature until they are in need during a road side flat tire event.... wrong time especially if you're on a long road trip or especially if you've changed to larger tires. You can go a lot of places on a 19 or 20" wheel/tire but you can't really be doing much of anything except finding the nearest tire shop if you're stuck using a skinny doughnut spare. Even HSE models didn't have the full size unless the HD option was built.
Along the same lines, a means of reliable air supply so you can use lower pressures off pavement. Even many miles of forest road are much nicer at 30 psi than 40+ but of course be sure you're on a tire rated for the stresses caused by running lower psi in the first place. Don't rely on the little tools for wheel changes, just bring a 24"+ breaker bar and 23mm deep socket (new the nuts are 22mm but over time your shops like to ruin your stuff by using impact tools on these steel covered nuts which deforms them such that 22mm barely fits anymore, thus 7/8" or 23mm will be used by them and now you too
OR, replace the factory nuts with Gorilla brand which are solid and don't deform from the 22mm
Might as well if you go for black wheels too.
A note about the freezer/fridge people mentioned....HECK YEAH. You'll use it to go grocery shopping when you then want to also go do something else before arriving home. You can go hunting or fishing and put it all into freeze if needed, or take frozen goods for a week of camping, etc. It's awesome.