I have one of these trailers there 3D printed from https://www.kamodelminis.com/ there nice ! and you can get all the valves from Jamie at http://moluminum-com.3dcartstores.com/?fbclid=IwAR1YnU2VELtQ-A_Gigzk6jKiITu2HWkxiICt4QToFSdgx8DYr8Uyt3ejUP4 to complete the trailer I hope this helps !
This Trumpie/Magnafire kit looks pretty good ,there's a good review on you tube i may have to pick one up ,KA models still sells the super detail kit , but it's to much $$ for me !