If you mean hooking a small trailer behind a bigger trailer behind your truck, no. You can only triple-tow in certain states and provinces and only if the first trailer is a fifth wheel.
5 lug nuts is common in 3/4" size.
You would have to measure the bolt circle diameter, stud diameter, center hub diameter and back spacing on the trailer then match the new rims to those specs.
4 x 4 is four-wheel drive and 4 x 2 is two-wheel drive.
If you have a 4-wheel drive car it shouldn't be in 4-wheel drive but if you accidentally or knock it into 4-wheel drive you have a gear leaver like item at the side of your actual gear stick. It will be vibrating a bit but that's perfectly normal. If your 4-wheel stick is up then its in 4-wheel drive but if its down your not in 4-wheel drive.
Cars do not generally contain 4 wheel luggage bags. These 4 wheel luggage bags must be purchased separately. Generally any car can contain a 4 wheel luggage bag, but they must be purchased separately.
A car that has 4 wheel drive
It depends on the size of the tractor trailer. Find the dimensions of the trailer and divide it by 16 cubic units.
For off reading you need 4 wheel drive but for the road or for racing you need rear wheel drive and for rallying 4 wheel drive
17 inch
I would guess hardly any, unless it is a very small car.
It engages the 4 wheel drive system on the car. What it actually does to accomplish this can be very complicated and changes from car to car.