Family Ties - S1-E22
Visible crew/equipment: After Rygel's transport pod returns to Moya, as the docking bay door slides open, in the shot facing everyone while they have their weapons drawn we can see the bare floor. However, when Aeryn checks Crais for hidden weapons and then as D'Argo approaches him, there's a blue crash mat on the floor. Then it vanishes again.
Family Ties - S1-E22
Visible crew/equipment: After the transport pod successfully ignites the moon, D'Argo and John are floating in space while Aeryn's in her Prowler, and just as we hear Pilot start to say, "The offspring Leviathan, Talyn, has broken from Moya's side," we can see the face of Rygel's puppeteer under the table, at the bottom right of the screen.
Chosen answer: It's never explained. John mentions a theory that his less technologically developed craft simply interferes with the wormhole less than the "superior" Vipers, but they never make a concrete determination on that point. But we also have to take into account the fact that Moya traverses wormholes with no ill effect as well.
Garlonuss ★