Two alternative I considered some decades ago:
1. buy a minibus or slightly larger (the kind used to ferry families to airports):
- rip out the rear seats and install scope in the rear, rough estimates suggested quite a large SCT or cassegrain was possible up to C14 or even a Meade 16, if you had your own mechanical workshop to do the mods.
- modify the roof to open as a "moon roof", ie a sunroof rather longer and wider than usual.
- pier supporting the mount had to include an electric hoist to raise and lower it by about 50 cm. These are just a big worm drive inside a column. Raised to put the scope up above roof height for observing, down for transport with the lid shut.
- Scope would probably be altaz mounted as this was a visual only setup.
2. Buy a camper van - the old type with the popup roof.
Gut the interior apart from the front seats.
Remodel roof so that it becomes a roll-off roof, with secure clamps holding it in place while in transit.
- scope pier includes adjustable electric hoist as above.
In each you'll have to learn to sit still - don't rock the boat !
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