I have to wonder who's engine Lehr is using, since they are 4 cycle. Ryobi?
I looked at Lehr equipment after getting fed up with multiple carburetor replacement due to ethanol in gas, but shied away after reading personal reviews that said the equipment was hard to start. Ironically, Ryobi 4 cycle gas engines have the same problem.
These must be really bad engine designs. Typically, 4 cycle engines are easier to start than 2 cycle, and propane engines are easier to start than gasoline engines.
I think there is a market here. People are tired of gasoline that doesn't store well, gasoline that absorbs water, and gasoline that often has ethanol over the rated 10%. The propane equipment manufacturers just need to build good quality equipment with easily refillable and economical cannisters.