I'm looking for a trailer sprayer (preferably a 15 to 25 gal.) for use with herbicides. To be honest, I'm not really familiar with the different makes/models, so any advice would be beneficial. For the last year, I've been doing a lot of "large" applications just with a Solo backpack sprayer, but as one can guess, I have to stop and refill frequently. Really just trying to simplify the process. Any recommendations?