Edgar
With your A10 you might be able to get a hold of an old medial stretcher. You can raise and lower it. If you get one make sure that the device is able to release and lock with just yourself being able to grab the catch that allows the raising and lowering. I tried one but didn't get the right one so I could do it myself. Hunt around you maybe able to have one for single man operation.
My A10 is on a home made stretcher board that Dave Denison made that I got from him when I bought his Gen 3. It doesn't raise or lower. I am getting fairly good at finding the balance point when I am picking up the model at my home shop to move to my trailer. It is easier and less weight to remove the complete tail section. I have all power bus connections on my unit, so it is just a mater of disconnecting the one connector and the two bolts that hold the tail on and the tail is off. It is still plenty wide even with the nacelles on, but a little more manageable with that big tail removed. As you say when I am at the field am always at the mercy of kind friends to help me move this big mammoth when I need a hand.

Good luck. Hope you find a system that works for you.

AKB