while lifting the trailer off the ball of the car, all seemed well. All chocked up, trailer up on orange blocks solidly, the normal routine when putting the rig in the driveway.
Pulled the car forward a smidge to un lock it from the coupler.. I have to back at a slight uphill slope to get it in, and this pushes the ball against the clamp, so sometimes it sticks.
Lift lever, get ball loose and coupler released, pull forward a couple feet to get the car out of the way (Which turned out to be a good thing)
Trailer is leveled side to side, but due to the slope, I have to jack the front end up even more to level it front to back.
As the trailer front end is going up, it slowly started to slip backwards, and sideways,despite the chocks. I have a sidewinder, and appearantly, the pin wasn't fully engaged, and the wheel on it moved slowly toward the coupler, while the trailer slowly slipped sideways!
It didn't really SMASH to the ground, it slowly came to rest on the wheel of the sidewinder. Good thing, as the coupler never touched the ground. The coach bounced a bit. The sideways roll made is slip off the orange blocks
Several 4x6s and the nieghbors floor jack got it back up to a precarious position, enough for me to get jack stand under it.
An inspection shows no frame damage, but boy, it was like a slow motion horror film!
Besides the frame, what else should I be looking for?