Wow! I'd be a bit nervous moving something of that size without sufficient support on the flatbed! Heading down the road, flexing of the truss system would most likely lead to fatigue cracks/failures eventually. Also, that's a huge chunk of glass. I'm not well versed in the properties of glass but I would assume that too would need a beefed up support (greater than 3 points as found on my itty bitty teeny weeny 10" Dob. :-) Oh, I was wondering how much flex there is in the truss system when it is taken from straight up to a near horizon position. There will be some flex in A36 carbon steel truss system. Does he have to re-collimate with major changes in declination? Bruce Equipped with his five senses, man explores the universe around him and calls the adventure Science. - Edwin Powell Hubble