I will be purchasing a Lazer Z XS 60" 31HP but will need a w/b. I'm not sure if the TTHP 36" is the right choice (only 15hp engine) or the TTHP 48" with the 19hp. Does anyone have experience with either of these two w/b's? Some of my accounts have hills and various grade changes and I'm not sure what new accounts will be coming my way. Just starting to build my business. Opinions please! Thanks!