The gas version Destination used the Workhorse UFO (Universal Fuel Option) chassis, which is a rear engine platform that can use either gas or diesel power. It never caught on very well with customers, and most who were willing to pay extra for this chassis & model selected diesel power anyway. None of the RV manufacturers found much market interest in the UFO chassis and it quickly withered away. Forest River and Gulfstream also built coaches on the UFO chassis but soon dropped them due to lack of buyer interest.
I don't know of any problems with it, but as John says, there are few of them around and we haven't seen any feedback on the gas version here. Nor have I seen any elsewhere. There was an early ( 2006?) problem with the engine fan clutch that was fixed via recall, but I've not heard anything else since.
Note that while this is a rear engine platform, it is not the equivalent of a diesel pusher. It does not have air suspension or air brakes, for example, and GVWR is 26,000 lbs, if I remember correctly. Basically just moves the engine noise to the rear and eliminates a "doghouse" up front to cover a front engine.