I have a similar situation at my house - in order to camp by my lake, I have a short, concrete-changing-to-gravel hill to go down to get the camper next to the lake and back up the hill to get it back out and on the driveway.
I've been considering having a receiver put on the front end of my Lincoln Navigator to 'push' the trailer around. I would need a dropped hitch bar as well.....I never considered that the bolt from the ball would hit.....I've also been considering the rollers.
I think the ramps are a great idea! I might try that but woe to me if the trailer would stray from the ramp and fall off while I was backing it. I think I would have more control pushing it.
Liz, Brian and 3 Yorkies
The Silver Pearl & The Black Pearl
2008 25' Safari FB SE Queen converted to King
2014 Ford Expedition EXP Limited 4x4 V-8
McKesh towing mirrors
Hensley Swift-Arrow Hitch