Just remember if your Blackstone has it's own pressure regulator the propane lines in your trailer are all low pressure (after the trailer regulator). You will likely need to modify the Blackstone to bypass/take out the regulator on it. It can be done and there are other threads on how to do it (and I think there are parts kits sold). But it is certainly doable.
Here is a Youtube video where the guy talks about it and shows how to make the modification (with his parts list cut and pasted here). With this modification you have both the original high pressure (screw in tank) regulator and the low pressure RV quick disconnect propane options. Just use the adapter or the original unit:
- 1 - Spare regulator assembly from Blackstone - $10
- 1- Trico FA-1007 Brass Central Lubrication Adapter, 5/16"-24 Female x 1/8" NPT Male (Amazon) - $10
- 1 - 1/4" Female NPT to 1/8" Female NPT Reducing Coupling ( Amazon or Hardware Store in Plumbing Department) - $3
- 1 - Propane Gas Quick Connect Adapter 1/4" NPT Male Plug (Amazon) - $9
- Note: you will also need an extension hose that has a 1/4" male quick connect on one end, and a 1/4" Female quick connect on the opposite end. Cost varies depending on the length of the hose.