Pop-up lift options?

As we've looked at Popup truck campers, we see several systems for raising the roof. Many of the older ones have the cantilevered bars with a crank on the inside - I can see a bonus in offering a place to hang wet towels. The '02 Palomino we looked at had an exterior crank, similar to a popup trailer; and this seemed to offer more interior cabinet space. Four Wheel has cantilevers on the ends with a D-handled thing.

Is there anything we should be leery of? They all seem like proven systems.