Yes, we have silk quilts. The great benefit is they take up so little space. A standard duvet cover almost adds more space and weight than the duvet. You can't use quite the same tog rating comparison with standard quilts because of the way silk regulates body temperature. They are cool in summer and warm in winter, especially if you use both the summer and autumn together. If you go for the all silk type, they are very hypoallergenic. For this reason I don't see the point of having a silk filling in a cotton casing (eg John Lewis), as they are less hypoallergenic and bulkier. I prefer the all silk type, eg from
Silkwood Silk, but there are other suppliers. The duvets are best aired out in sunlight.
Small pack size is a big Cali advantage. The downsides are cost and lack of weight; they may not suit if you prefer heavier bedcovers.
For the roof bed, we also use a washable wool mattress topper from
The Woolroom, which was previously recommended on another thread and is also hypoallergenic and good at regulating body temperature. The small double is a good fit, but obviously you have to remove it before closing the roof, so that adds some bulk to your overall packing. They are currently 25% off, but still quite expensive.