Tent camper is exactly right. There has never been a lift-helper for the shells, although many Forum members have suggested that there should be one, and a couple have suggested ways that the factory could make one. But nothing has ever come of it.
But all is not lost.
The shells are quite heavy - several hundred pounds each. To make it possible to open them by hand, they are counter-balanced by things called torsion bars. Each bar exerts an upward force on the shell, and there are four torsion bars under each shell - one at each corner, more-or-less. The force of the torsion bars supports most of the weight of the shell as you open. And their force is adjustable over a limited (but generally adequate) range. Each torsion bar has an adjustment under the trailer. As Tent Camper suggested, there is a lot of discussion about torsion bar adjustment here on the forum. You will need to join the Forum to find and read these posts. Or you can have a TM dealer do the adjustment.
Bill
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