Having tried all the available racks for the Bike Friday Tikit I think the PR style rack offers the most capability for a variety of loads as long as you are okay with a slightly wider fold.
You certainly can’t beat the ease of placing a box or bag on the PR rack and securing it with one strap.
The low forward position of the cargo minimizes the impact on handling and it’s right in front of you so you know the status of any precious cargo.
The Tikit rolls and folds normally with the PR rack in place, but the overall width is larger which may not suit folks who take their Bike Friday on busy public transport. I don’t ride the bus with my bike so this isn’t an issue for me.
I rarely need more cargo hauling capacity than the front PR rack provides, but the whole rear of the Tikit is empty for carrying another box or a couple full-size panniers on a folding touring rack.
If you are keen on one of these racks for your Bike Friday there is sadly no production source at this time. However, there are a number of custom fabrication options in most towns that can replicate this rack if they have your bike and some photos to work from.
BTW – if you are wondering why they are called “porteur”racks or PR racks it’s because in French “porteur”means Pretty Rad = “PR”….;