Try Ronstan 19 mm I-track with the 6 wheeled traveller car.

It is being used on some F16's including my own and it works like a charm. I never wrinse the damn thing and I store my boat at the beach front 6 months of the year (salt and sand). The recirculating **** is always jammed, the I-track never is. And it has full ball baring stainless steel wheels.

Don't use the 4 wheeled cars for this rails as they are just loaded up to much for a cat like the F16's and P19's. These 4 wheeled cars tend to break after a few years. 6 wheeled one never do.

Wouter