Hi Julian,
I had two U-bolts welded to the inside front corners of my trailer. On my SDM telescope I have a split wheelbarrow handle system. This allows me to leave the front ends of the wheeling system on the scope, providing two tie-points to secure the scope to the U-bolts. This system works very well, meaning there is never any movement of the scope in the trailer.
I would never put my scope in the trailer, though, if I was driving through rough off-road driving. I am happy to have the scope in the trailer if the driving is 99% surfaced roads, not otherwise. I have heard stories of people cracking their mirrors when doing rough off-road driving with their large mirrors in their trailers. In my instance, I am lucky to have a boot large enough to hold the primary mirror box (2010 Odyssey), so that is where the scope goes if I am going dirt road driving!
Always put a tarp over the trailer. I had my mirror box blow off early when I wasn't covering the trailer! I also realised how quickly the weather can change, and then everything gets wet!
I also had the trailer-maker provide me with some ramps. Without them, there is no way I could get the scope into the trailer without the aid of another adult. In Sydney, Mario's Trailers are very price competitive, and I have been happy with the trailer they supplied to me.
Good luck with your plans.
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