Since there's a limitation to the amount of money I'm willing to spend on my A1500, and the RapidRoad would have required that I first bought a network card, I decided to go for a MiniThylacine instead. But I had problems with it as well, as can be seen in this video:
https://youtu.be/c0ZwjEyKn_cBasically, I had to remove my SupraRAM 2000 card in order to avoid slowdown on my Amiga. After this was done, everything worked just fine. It must be said however, that my Amiga was soft-kicked to KS3.1 while doing this, and I didn't use Trident in my tests.
I bought the MiniThylacine card on EBay in May, where the seller (genny flick) said it would be the last one for 2-3 months. But maybe he will start making new cards soon.