Figured you folks would appreciate this. I have a bunch of family coming over including a cousin who's a quad and drives an Ironside type of wheelchair. I had made some 2x6 ramps a while ago but they were hard to navigate and not very stable. I overlaid some 3/4" plywood and adjusted the height so everything lines up well with reinforcement along the wheelbase width of about 25" (total weight of him and the chair is about 350-400 lbs). If my hill were frozen it would be great, but as long as its dry he can motor up it pretty well.

One question, I bought some basic 2.5 and 3.5" inch nails that kept bending, any of you real carpenters have some advice in that department?

I'm not a "real carpenter", but have done major construction around the house (including a 2000 sq ft addition).

For ramps, decks, porches, etc. I much prefer 3" deck screws over nails. However, when using nails in harder woods, I pre-drill the nail holes with a small drill. My father-in-law (a real carpenter) also was fond of rubbing nail tips on a bar of Ivory hand-soap first - it DOES make a difference (acts as a lubricant).

I should have used screws. What started as a simple project because much more complex. That bottom ramp got quite heavy after all the reinforcements. A friend came by to admire my craftsmanship (if you can call it that), he said that 3/4" plywood used to have 7 layers about 10 years ago and now only has 5. He said the 7 was better (they used them at work).

I had two 2x6 ramps that we used last year, the problem is that the front and rear wheels aren't in perfect alignment (front wheels are 21 inches apart, the rear are 25" apart. That left very little margin for error and a slip would be a disaster. With the plywood he has an extra 5" of room on each side and can maneuver a bit if needed. It also feels much sturdier.