There are two options for installing racks on the fiberglass top: 1) top-mounted tracks, like SMB installs, and 2) side-mounted brackets that accept raingutter-type towers.
If you don't need the ability to relocate towers based on loads, a cheaper and easier (IMO) option is to just install Yakima or Thule mounting brackets on the side of the PH. You'll see this a lot on VW Westfalias. In fact, I did it on my old Westy, and posted a how-to writeup on my website at http://www.brianwasson.com/misc/yakima.htm
I assume it would be basically the same install on the SMB PH. I sold our Westy back in 2005, but the new owner lives near me and has had no problems with the brackets in the eight years since, and he hauls his kayak on it back and forth from here in PA up to Maine where he has a cabin.
To go this route, you'll need the brackets (I used Yakima "Wide-Body" brackets), raingutter towers (like Yakima 1A towers, easily found at good prices on Ebay or elsewhere; I got mine for around $50 for all four), and bars wide enough for the van (Yakima calls for 66" for our vans, but you might want to go to the 78" to have extra space to work with). With a van as big as a Ford, I'd install three sets of bars. Many Yakima/Thule accessories have defined spacing requirements (like boxes, tandem bike carriers, etc.) so be sure you know what those numbers are and install your bars to fit. If I were doing it on my SMB (and I still may), I'd install two kind of close together toward the center-rear, to mount things like boxes, etc., and then one toward the front to allow easier carrying of long loads. I guess this might mess up the balance of raising/lowering the PH, though.
@stillvanin, I worked at a store called Outback (not the steak place!) back in the late 80s/early 90s. It was in Blue Bell/Norristown. REI opened its first PA location 10 minutes away, which was the death knell for our shop. Let's definitely hook up soon! You are so close. In fact, I think we may have seen your van a few weeks ago. We were driving on Roosevelt Blvd. near Byberry Road and my son said "Look! A camper like ours!" I told him it was probably just a conversion van, but then remembered that you are in that area, so maybe it was you?