Originally Posted by unterhausen

there are chain tugs for forward-facing horizontal dropouts.

MAPP is hotter than propane, but to really get to brazing temperatures, you need oxygen. The cheapest way may actually be to get a used oxygen concentrator, a propane tanks and a real torch and then sell them when you are done. It's not likely to be a money-saving experience if you just build one frame. That first frame is expensive.