The oem frame tank is empty, thr RV isn't going any where until i can pull together the $$ for the transmission repairs, $60 extend a stay
$18 for this one, yes it could have been connected to the main tank, then i would need another $20+ hose between the adapter T and portable cylinder, and i would still lose line pressure, when refilling the portable because the main is empty,
Is it slightly less convenient. Maybe , but I'm stretching my $$ as far as i can, this is about keeping the fridge cold and me warm, the least costly ways possible, not about bbq or line loss ehich is a very small volume, and in a pinch i can even connect a 1# cylinder while getting the 20# portable refilled