I can no longer lift my Fender Rumble 150 due to a recent permanent injury and my research show that a Gallien Kruger MB115 and a Hartke KB15 Kickback are much lighter and I can handle them. And now I'm hearing about the Fender Rumble 200 being a light weight power house. How do these three amps compare? I use a five string and need the solid bass to carry the low B. Thank you..