Without knowing the history of your trailer I would suggest that could have spider webs inside the lines coming from the regulator to stove. The other is a defective regulator that lowers the line pressure too much. A good shop should be able check both pressure and flow of
propane to the stove.
FYI, The Suburban stove top in my
Scamp works great. We boil water almost every morning to make coffee. (cone drip) It takes 5 to 8 minutes to get about a quart of water boiling.