Nothing is as easy as it first appears.
If I understand your post, this is the situation you have:
You are backing your trailer up hill in a concrete driveway.
The slope is ~ 10% (as a rise of 5.5 inches in 5ft would = 110 inches (9.2ft) in 100ft for a 9.2% grade). Sounds reasonable and your drive drains to the street nicely.
You want to be able to back up; then stop; then place a ramp in front of both front tires; get back into your Ford and pull forward to raise the front axle up until it's on the same level as the rear axle. End results will be the rear tires on concrete....front tires 5.5 inches higher sitting atop a platform. Platform needs to have slightly larger surface area than the "footprint" of the tire to prevent damage to the tire.
The problem is the tight spacing between the tires!! As you pull forward up onto a ramp, the rear tire will encounter the leading edge of the ramp and begin to rise, before the front tire reaches the plateau height you need.
Here's some food for thought as you think this through. Others may join in.
Cut a 4x8 sheet of treated one inch plywood into strips, whose width will slide between the two tires (you measure it). They should be 2-3 inches longer than the tires are wide. For sake of discussion, lets say you find a panel 8 inches wide will slide between the tires and 14 inches long extends an inch or two on either side. Be ready to make a lot of these!
Stop well ahead of your final parking spot (only performing this once or twice will allow you to mark the starting line to begin).
Put 1 or 2 panels between the tires on both sides of the trailer. Back up 8 inches and stop atop this first "step up".
Put 3 - 4 panels between the tires. Back up another 8 inches and stop again.
Repeat the process of building a higher platform between the tires, until the front tire is restings on a bed of panels stacked 6 deep (6inches high)
Your final step will be to put another 6 panel stack between the tires and butt them up against the 6 already under the tire (a total of 12 panels).
Finally, back up onto this platform that is now 16 inches wide, 14 inches long, and 6 inches tall under your front tire.
Before unhitching, securely chock between your tires......I'd invest in one that locks between the tires
Realize, that the process of pulling forward will involve stacks of 5, then 4, then 3 platforms ahead of the front tire; with pauses every 8 inches to pull out the panels from between the tires. Tedious but workable.
Solution Two (and I am not the one to judge if this is even safe or structurally possible
Can you slide a floor jack up under the front axle and raise it enough to place a platform of 5 or 6 panels cut 16 inches by 14 inches under the tire?
If "yes" is your answer (and I don't know
); then you could use some exterior adhesive to "glue up" 5-6 panels together into a stack.
Repeat the jacking process on the opposite side of the trailer....again with some sort of chocking to prevent an unexpected roll.
BTW -when the platforms are not in use, drill a hole near one edge and pass a 12-18 inch loop of poly rope through it, knotted at one end. This will serve as a grap handle to pull the platforms back out and will allow you to hang them up on a hook in the garage when not in use.
Realize, that preparing to pull forward will require this same process of jacking up the axle to remove the platforms. You judge which is less tedious, best works for you.
BTW- your jack stands and front jack will look nicer if you take the remainder of that 4 x 8 sheet of 1 inch exterior treated plywood to glue-up some 6" x 12" blocks, each made up of 4 - 6 layers. Think how nice it will look to replace those chucks of concrete and scraps of treated lumber with the blocks you make. I mounted an aluminum truck bed tool chest on the tongue of our TT, so I can load my blocks and take them to the campsite, where they are used to support the scissor jacks.....makes for far less cranking! Luckily I was able to re-purpose a 50+yo, 6 x 8 treated mail box post that finally broke off at the ground, into several 6 x 8 x 6 blocks that are very light weight d/t their age.
Wait a few days and see if there's an engineer out there with a better solution than these! Good luck! peace/out