reducing weight less propane tank

I'd keep two for the backup function, so switch to 20# instead maybe. However, propane tanks aren't your problem with packing and unpacking and if a difference in 30# tongue wieght makes a difference I would be looking somewhere else

I have 2 30# tanks and if I can get them to fit will switch to 2 40# tanks. Like you don't use much propane except in the fall and then running the heater can use lots of use of quickly. Last thing I want to worry about is having propane.