It's worth mentioning - gently - that most LF photographers are unfit middle-aged men, and that tends to skew the definition of 'portable'. My take is that if you can manage an overnight backpacking rucksack, with shared tent, cooking equipment, food and water, you will have no problems whatsoever with a monorail camera on day hikes. If you can manage a MF outfit in a shoulder bag, an LF kit in a rucksack will not present any difficulties in terms of pure transport.
I use a Sinar Norma in the field. It's bulky, but the weight is no so very great and I value the versatility and the easy use of long lenses. For me, the best thing about the Sinars is their ability to compress down onto a single six-inch rail. The camera becomes a compact brick that can easily be stowed away and carried. Some of the cheap monorail options have rather long minimum rail lengths, which makes field use much more awkward. Even so, if you are working a few hundred yards from a car, even these are not that hard to carry.