I've decided to move from using granular products to liquid products. Last summer, I used backpack sprayers to spray in some yards; but had poor results except in small yards. It seems impossible to do a good job of spraying a large lot with a backpack sprayer. We plan to put the tank sprayer in the back of a 8 foot bed in a F250. What are the main considerations I should look at? What is the best manufacturer. Price is a concern; but I don't want to "cheap it" and have to replace the system in a couple of years.