I am looking to purchase this pellet grill. I have always had a smoker and a separate grill. Is it possible to grill burgers/hot dogs on this as well?
You can, but you may not be thrilled with the result.
Pellet smokers generally work on indirect heat and work best "low and slow". There is an inverse relationship between smoke and heat in pellet smokers. The hotter they run, the cleaner they burn and the less smoke you will get.
So, you can crank up many pellet smokers hot enough to cook burgers/dogs or even pizza - but they won't get much smoke flavor. Also keep in mind that you will have to burn a LOT of pellets in a hurry to get those high temps, so it is not very economical.
Some pellet grills have a "searing" feature/accessory (like this one for a Louisiana Smoker
http://www.louisiana-grills.com/sho...-TG300-&-TG300ss/p/48464914/category=17769002 ) that can help make a smoker cook more like a direct grill, but it still won't be like a classic BBQ grill.
That said, you can slow smoke hot dogs (wonderful flavor) on the pellet smoker, and my kids beg for slow smoked stuffed burgers from the pellet grill - however, if you are looking for "traditional" grilled burgers and dogs, it can be done, but not well (IMHO).
So, personally, I still keep my trusty 15 (?) year old gas grill (the first charbroil stainless - when they offered a real lifetime warranty that they have grown to regret) that I use to burn up burgers and dogs, and we have several pellet smokers (and several other smokers too!).