* Let's see???? I have several ways to jack-up my trailer, if I ever need to change a tire:
- 1) a 5000 lb scissor jack permanently mounted under the tongue (or the detachable jockey-wheeled 2000 lb jack there, too) can lift the front end after I drop the two pipe-clamp rear stabilizers to the ground (capable of holding 1200 lbs),
- 2) using either my old Chevelle's bumper jack (2000 lbs capacity) anywhere on the trailer frame, and/or my Hi-Lift jack (tested to lift 7000 lbs), also anywhere on the frame, 3) a portable 2000 lb trolley jack I also keep in my truck's crossover box with the bumper jack, or with my two Powerbuilt 3-ton Uni-jacks (which I also carry on trips, to lift my heavy pickup as well) under the axle.

- Powerbuilt 3-ton Unijack.JPG (56.6 KiB) Viewed 7403 times
* I formerly pulled my racecar to drag strips via some sketchy roads, where many jack, block and tackle, and what-have-you were used to lift loaded trailers, trucks, and race cars from all sorts of uneven spots. I started carrying several jacks, plywood and lumber pieces as bases, and even used my on-board pickup truck crane (now removed, just this month) to lift vehicles up and out of ruts and roadside ditches, usually with blown Chinese trailer tires, but also with "streetable" racing slicks (prone to flats from road debris) over the years. You can never have too many jacks!
* Also, I avoid flat tires by using LT tires on both my truck and trailer, now, with better construction, thicker tread, and more sidewall plies than ST or most auto tires. And, my spare(s) are always checked before trips, and my spare is easy to get to (though not for a thief), on the front wall of my TTT. I'll never have to crawl under a trailer to remove a spare, like some others do (but I still have the truck spare underneath, unlike on my '69 C-10, where I had a bed-mount for it). Hopefully, my tire troubles from past years will not revisit me, but I'm prepared.
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EDIT I also carry a small air compressor, which has filled many a tire at dragstrips in the past, I hope I'll not have to use it either.

- HF air compressor in a carrying case, in my truck box.JPG (34.81 KiB) Viewed 7401 times
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Edit 2 My neighbor just returned my "missing for five years" 12-ton bottle jack, so it goes into my tow vehicle storage box, too.