Is it possible to connect two 12ft Track Systems to enlarge at 24ft length ? Do you have some extra connectors for that? Cause the track is closed at the end.

Yes, you can connect two Proaim12ft Straight Aluminium Camera Dolly Tracks to enlarge at 24ft length with the help of connectors and connectors are included with the tracks.

Which tripod dolly model is compatible with P-TRK-12 Tracks ?

The compatible dolly for PROAIM 12ft Straight Aluminum Camera Dolly Track is the Proaim Swift Camera Track Dolly. Here is the link for your reference:
https://www.proaim.be/products/proaim-swift-dolly

I don\'t see a screw hole in the middle track. Therefore how does it connect more than two pieces together?

"You can join 2 PROAIM 12ft Straight Aluminum Camera Dolly Track using the Nylon bushes that we can provide."    Here is an image for your reference: https://prnt.sc/oE9-YPEueE61  

Will it support heavy duty crane package?

Yes, this track can bear the maximum weight of upto 400kgs and so it will support heavy duty crane packages easily.

Are the rail pipes hollow or solid?

The track rail pipes are hollow.

What is the warranty?

We provide 1 year warranty from the date of purchase. Items which are covered by the warranty period will be replaced at no cost to the customer. Replacement parts of the product will be provided at nominal cost (covering the cost price of the replacement parts only) to the customers after the Warranty Period has expired.

Can I join two tracks to extend the length?

Yes, you can join two tracks together to extend the length of the track.

Can its center distance be reduced?

No, it is not possible to reduce the center distance.

Is it returnable for a full refund if it doesn't meet my expectations upon delivery?

Yes, absolutely. We always backup our sales. In case, you don't like the product, we take it back within 30 days and you get a 100% refund.