I haven't been on the portage myself (one of the reasons I want to give it a go), but looking at the elevation chart I made on mapmyrun.com, it looks like the first quarter starts a little steep coming off the lake but levels off, the second quarter climbs 60m to the peak of the trail in half a km, with the remaining half of the portage rolling within a 20m range from the peak. Best I can do without being there. I'll check the web and see if there are any horror stories about that portage. There're probably all terrible because nobody wants to let on that there's a beutiful interior lake within such easy access of the main roads. Either way, my trip report will confirm that this portage is absolutely the worst I've ever been on and that I'd definitely recommend that anyone with any sense consider another lake to camp on!
But we'll see when we get there if that's the route we choose. Likely we'll want to double carry the first quarter and second half and double carry the hill. We'll see. We should also have enough guys to share the load of any group gear we bring in (extra tarps, etc...).