We have a summer/vacation home that we inherited from my dad. While we have a guy who cuts the grass, the gas string trimmer only gets used a few times a year, which does not work well at all. Usually a big production to get the thing started. I want to replace it with a cordless trimmer, but whatever trimmer I buy needs to be able to cut through tall weeds. Any suggestions as to voltage and line size? They almost all have smaller line sizes than a gas trimmer.