To OP
If you don't mind me asking, what brand trees did you purchase and for how much?

 

I found a pair of Triple Trees from the The Trike Shop used on Ebay for $275 so I grabbed them, normal retail is $700 I believe

 

I had the rear leak on mine (18"). When I pulled the tire off it looked like when they were trying to ge the tire on the pryed against the sealant around the rim and jacked it up causing a leak. I didn't even try and ifx it, put a tube in it. Like others have said, just tube it and save the headaches. Good luck!