I have an Excalibur dehydrator and I love it. It's the 9-tray one model #3900. Here's a link so you can see what I'm talking about
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9-Tray Large-Excalibur #3900 - Commercial Food & Fruit Dehydrator from Excalibur
I've read that Excalibur is the top of the line (but, of course, it depends on who you're talking to, I would guess). Mine has 15 square feet of drying space on those 9 trays as opposed to the 9 square feet you have on the American Harvest. On the other hand, I can't expand that. However, I find those 9 trays are usually more than enough room for me. I mostly use it for drying herbs from the garden and those 9 trays hold a lot of parsley or basil, etc. About enough to fill a quart sized canning jar. I'll just do a load of parsley one day, a load of basil the next, a load of sage the next, etc. I used it for drying apple slices this fall and I think the 9 trays yielded about 4 quart jars of dried apples. Most of the time I don't use all of the trays because I just don't have enough to fill them. We don't grow fruit so what I dry (other than the apples that came from my b-i-l) I buy and it's pretty hard to find good deals on fruit. I still freeze or can the majority of my veggies from the garden, but I often think (as I'm throwing out that soggy celery) that I really need to start drying things like celery and carrots for soups. I have dried onions when I've found a good sale and then ground them up in the food processor creating onion powder and onion flakes. I'd suggest doing that in your garage or outside if possible. Your house will smell like onions for weeks! Same thing with hot peppers. I dry cayennes and some others that we grow to make into powders. Do it outside!!!!!
My motor is on the back of the unit. I don't see how having it on the top would affect the amount of juice dripping down. Actually, I don't know why you'd ever have juice dripping down. I did see that the American Harvester has more wattage than mine, but I've never had anything dripping. The whole idea of drying is to dry it slowly so it dries evenly. Not to cook it so that it's dripping out its juice. I would think that having it on the top would dry the top trays way before it would dry the bottom trays.
Have you looked at the yahoo food preserving group? There's lots and lots of info there. Just go to
Yahoo! Groups - Join or create groups, clubs, forums & communities and then look for preserving-food.
Good luck. Now I think I'm going to have to slice up that celery that's sitting in the back of the fridge and maybe those carrots and dry them tomorrow!