Everything on RAMs is metric: 7, 8, 10, 13, 15, 19 or 21 or 22 for wheel lugs (mine are 19mm. But other trucks have different sizes depending on model - so take the one that fits your lugs.) Get a BREAKER BAR: NO IFs, ANDs, or BUTs! I have run into multiple situations where a nut either got corroded enough to be frozen on or where some JA over-torqued my lug nuts during the last tire change and couldn't break them free with conventional ratchet! Also, get a torque wrench capable of 25-180 ft. lbs. I personally have one that can torque from 0-250 ft. lbs. Good set of ratchets and adapters that allow you to size up or down from 1/4 <--> 3/8 <--> 1/2 ratchet sizes. Have at least two sockets in each of the metric sizes above. Have at least one extension in 3", one in 5" or 6". Have #1 and #2 Phillips screwdrivers - both in standard length and stubby lengths. At least one large and one small adjustable wrench. A proper jack, and also a set of jack stands, plus at least one wheel chock (two is better!) A set of torx and a set of hex wrenches in metric. If you bought the truck used, a set of standard wrenches is a good idea, but not necessary if you bought the truck new. Lastly, put a set of road flares, HEAVY duty jumper cables or optionally an emergency jump box (make sure it's charged), spare headlight/taillight bulbs (or two) - if they're not LED types, a quart of oil, and gallon of 50/50 coolant. Throw in a high-powered flashlight and strobe, plus a SHARP good quality utility knife with a locking or fixed blade (3" is fine and should be legal in all states - but I can't swear to that - so look up laws on knives in the states you'll be visiting). Add some duct/duck/100 mph tape into the kit, and some electrical tape, a tire patch kit, and you should be good to go.