I use a Toho FC-45X. With one or two lenses, it might weigh between 7 and 9 kg, depending on the lenses. You are highly unlikely to find a tripod (including head) adequate for large format photography weighing less than 2.5 Kg. My film holders weigh just under 0.15 kg each. Remember also that you will need an exposure meter, a dark cloth, a cable release, probably a loupe, and other miscellaneous items.
I used to put a kit including my Toho, three lenses, an exposure meter, a dark t-shirt to use as dark cloth, and a few additional accessories in a small backpack designed for use with a 35 mm camera. The total, including back pack, weighted less than 30 kg. I carried six film holders in an insulated lunchbag hanging from my waist, which added another 1 kg, and I hung my Tiltall Pro tripod, weighing about 2.5 kg, over my shoulder with a strap. I was able to go pretty much wherever I wanted without too much trouble with that equipment.
I got the Toho because I have spinal stenosis and am limited in how much I can carry on my back. Unfortunately, the stenosis has progressed, and i can no longer do that wiithout paying a price in pain a discomfort later. So I usually carry things in a Baby Jogger, which would be impractical in your situation.
You can find a review of the Toho at
http://www.thalmann.com/largeformat/toho.htm
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