Since we'd be making rollers for two, we need
2 empty oil cans
some dirt or sand
and two long pieces of wire
using icepick or some other sharp thing
poke holes in the center of both ends of both of the cans
Run (thread) one wire through one hole out the other end of the can.
(Do this with both oil cans)
Twist the two ends of the wire together.
Fill both cans with dirt (through the hole the oil was poured out of)
The wire is used to pull the roller.
Ready to go.....
Length of legs don't determine who'll win roller race....

jt