I saw your message on fetlife about looking for a fucking machine (got too scared of that site after the creepy hardcore dom DMs started flooding my account post-setup, lol)
Check out the Hismith machines if you're still looking for a mechanical friend. They're decent quality for the cash and you can get them on amazon, which is convenient. People strap massive toys to them and they take the extra mass with grace, just be prepared to spend >$400 for the luxury of hour long robo-ruttings.
https://www.amazon.com/Hismith-Premium-Machine-Wire-controlled-Dildo/dp/B01N6340A8
Have fun and stay safe out there!