One will go into the back of a 06 Dodge Grand Caravan quite easily and it only takes one person to load it. Wheel the ranch over to the vehicle so that the rear (big wheels) are closet to it. Carefully take the lid off and set it down on something other than concrete. Remove the grill and charcoal grates as well as the ash catcher. What's let probably only weighs 20lbs or so. Facing the vehicle, grab a hold at about 9 and 3 o'clock and lift up tilting the grill towards you, lifting the back of the grill up to the deck of the vehicle. Get the rear wheels on the deck, then move your hands towards the front and lift the front of the grill while rolling everything back into the vehicle. If vehicle is enclosed, you can put the ash pan back in it's normal place. While the front of the grill is still close to the back of the vehicle, put the charcoal and grill grates in place. In my van, the rear opening is smaller than the actual cargo area. So, push the grill back a bit to where the roof is higher. Bring lid in at an angle and finesse it until it sits in it's normal position. Lock the front casters. I don't have any tie down positions in the back of the van, so I just kind of fill some space between the legs and the sides to keep it from rolling around (which it will do even with locked casters).
Kind of a wordy response that might seem time consuming, but it ends up only taking about 5 mins to load or unload, and again, only one person needed.