Wheels vs Rollaway - What's the difference?

As a noun wheels

is plural of lang=en.

is third-person singular of wheel.

having wheels to allow for storage.

(head) (plural )

(by meronymy) An automobile or other vehicle

:* Like my new wheels ?

:* rolling 18 wheels

(bodybuilding, slang) Well-developed thigh muscles.

* 1999 March 22, “OB205”, "Re: Freakiest Bodybuilder?", misc.fitness.weights, Usenet

Martin: Just for legs, Tom Platz in his heyday has never been approached.

OB205: I totally agree with this, even to this day no one can beat those WHEELS !

* 2004 December 28, Mark Jenkins and Jeff O’Connell, The Jump Off: 60 Days to a Hip-Hop Hard Body , page 76, HarperCollins

But Mary J. goes all-out during big leg day, and look at her wheels —toned but very feminine.

* 2006 April 30, Jim Stoppani, Encyclopedia of Muscle & Strength , page 131, Human Kinetics Publishers

... try this big wheels program to pack on muscle to your quads and hams.

(head)

(wheel)

(-)

Having wheels to allow for storage.

:This rollaway bed goes under my main bed.