Uhhh guys, I hate to bring you the news...
The SRV had it's weight doubled to 4t.
That's a rumour. Or do you have a link to an official statement about that?
So far I don't really noticed a difference when driving. Yeah, the SRV might be heavier, but perhaps it's not and everything is like before. I also think terrain didn't change, but only colouration. At least I didn't hear or read anything official about that.
When stuck I usually put all pips on engines for more power and longer air time. Perhaps that helps?
What also works is closing the game and start it up without horizons. You will be relocated into your ship and placed in orbit.