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If you need a LOW COST solution for the short term, go to your local junk yard and get the screw jack out of a F250 / Excursion. I have used mine many times to change flats on boats and heavy duty trailers. It is REALLY short and fits under the spring and it's REALLY easy to crank being geared very low. If you can get the first extension with the hook, that's all you need. Find an extra 3/8 or 1/2" socket and hammer it on the end for your ratchet or impact.
I used the a ramp on my first boat trailer and bent the end axle. Maybe it was already bad, I don't know, but now I'm leary of them.
That swivel thing on the side of that one trailer looks flat out scary. At least for heavy boats like run.
For the lug nuts, check em for corrosion before you leave. If you see any, spray them down with corrosion x red before leaving. The heat from your hubs will help it creep in for easier removal.
And like most, I clean mine twice a year AND they get sprayed every time they get saltwater wetted.
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