In Exodus, the entire Isrealite population leaves Egypt and heads into the desert. The logistics of 2 million people wondering in the desert presents an impossible task.
Given the sheer size and weight of what the Israelites had to lug around, no wonder it took them 40 years to travel to Canaan, which most people of the time accomplished in 10 or 11 days. The weight of the tabernacle (not counting the ark and other structures) was 11 tons:
* 1.00 tons of gold;
* 3.75 tons of silver;
* 2.50 tons of bronze; and
* 3.75 tons of silver in the bases for the sanctuary.
2.0 million people marching ten abreast would form a line 120 miles long. Do the math.
This calculation does not account for livestock which they took from the Egyptians who didn't have them to give since the livestock had already been killed twice.