I dehydrate my own, but mostly for taste and nutritional reasons. Home dehydrated meals are not any more calorie dense than the commercial ones (most of mine average 105-120 Kcal/oz), but you can make them as big as you like.
I always add ridiculous amounts of fat to mine when rehydrating them. I generally like a good dousing of olive oil, but this past winter, I was adding 1/4- 1/3 stick of butter to each meal and loving it.
Packit gourmet freeze dried sausage is another calorie dense ingredient (like 198 kcal/oz) I'll use to jack up the calories and taste in some meals.
When it seems like it will go well with the recipe, I'll throw a couple tablespoons nido (143kcal/oz)in too.
Other than that, I try to maximize my fat calories throughout the day by munching on macadamia nuts (206 kcal/oz), artisanal sausage/salami, and hard cheeses.