I'm moving halfway across the country (California --> Colorado, but I'm not one of those Californians) and I am going to be towing a small 1000lb Uhaul trailer holding my possessions. I've never towed before so this 1000+ mile journey will be my first time, and in a gutless and old 4Runner to boot. I'm looking for any advice for towing with this particular vehicle, any problems areas, any parts I need to replace before doing it, and a bolt-on hitch receiver that you'd recommend (I do not have a factory one).

Specs:
240k+ miles
3.4L, 4x4, Automatic
3" coilover lift, 285/75/16 BFG All-Terrain

Recently added/replaced/serviced:
130k mile transmission
external tranny cooler
CV axles
LBJs
inner/outer tie rods
timing belt
radiator
water pump
all drive belts
front brakes
suspension
tires

The only problem is that I have a rear axle seal leak that has got some oil inside one of my rear brake drums.