I really like TEC 160 which is well built and good quality the same as A-P's products. It fits Mach2GTO very well. TEC 160 weight and length is manageable for me and I keep 160 on the mount in my courtyard covered by TeleGizmos360 in the summer. I will mount it on/off during the rainy season. I think you should have a permanent installation for 180.
Hope to see your crescent image too.
Jian Yuan Peng