All 3 Uses of

pallet
in
A Tale of Two Cities

Monsieur Defarge put this provender, and the lamp he carried, on the shoemaker's bench (there was nothing else in the garret but a pallet bed), and he and Mr. Lorry roused the captive, and assisted him to his feet.†
Chpt 1.6

pallet = a portable platform for storing or moving goods that are stacked on it

They had the air of a rough tribunal; Jacques One and Two sitting on the old pallet-bed, each with his chin resting on his hand, and his eyes intent on the road-mender; Jacques Three, equally intent, on one knee behind them, with his agitated hand always gliding over the network of fine nerves about his mouth and nose; Defarge standing between them and the narrator, whom he had stationed in the light of the window, by turns looking from him to them, and from them to him.†
Chpt 2.15

Nothing more was said, and the mender of roads, being found already dozing on the topmost stair, was advised to lay himself down on the pallet-bed and take some rest.†
Chpt 2.15 *

Definitions:

(1) (pallet as in: a shipping pallet)
a portable platform for storing or moving goods that are stacked on it
(2) (pallet as in: a sleeping pallet)
a simple, austere bed (such as a straw-filled mattress or temporary bed made on the floor for a child)
(3) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

More rarely, pallet can refer to a tool or part of a machine. It may also be found as a less common spelling for palette--a flat board or tray artists use to mix paints and to hold them as they paint.