I am new to North American FGRVs but not that new to light
trailers with noodle like frames... Personally, I like scissor jacks. Easy to use, (with extension) they are easy to crank up and adjust and relatively sturdy. Grizzly may be low but after factoring in the shipping, it may be cheaper to stop by a car scrap yard where similar jacks are a dime a dozen.
Donna is right - AFAIK most eggs have rather flimsy frames so, lifting fully up on the corners can put a considerable stress on the frame. By the same token, you put extra stress on it when you use the tongue support jack and two at the back of the frame. If you lift it off the wheels, the middle will sag = stress. If you leave most of the weight
on the wheels and use tongue / rear jacks just to stabilize, two people are the front of the trailer, it starts to sag (less but noticeably) between the tongue and the wheels. The rear jacks may even come (almost) loose and the trailer may start to wiggle... well, depending at what the two are doing at the front
Not that good. It's a fine balancing act. IMHO, the best is to distribute the weight
between the middle (by the axle) and corners of the frame. Easily done with 6 scissor jacks but requires some crawling on your knees. Worth it for a longer stay. Start with levelling front / back with the tongue jack wheel. Next, put two jacks under the axle
(or frame right by the axle) and it doesn't matter much if one of the wheels goes fully up. Than, level front to back again with the tongue. Next, snug up 2 jacks under the from corners of the frame. next, release some pressure from the tongue wheel / jack. Lastly, snug up two jacks under the rear corners of the frame. Wipe the sweat and have some wine or beer or better yet Canadian whiskey. Your trailer is sturdy as a rock and any stresses are well distributed between 6 jacks and whatever is in the glass
Oh, set the jacks so the middle is along the length of the trailer and front and back are along the with. Kind of like |=| Alternately, if you hate crawling on your knees as much as I do, put the ones under the axles on 45 deg to the axle
< and same for the front / back. Kind of <>< The reason for this is; scissor jacks are sturdy along the axle bot bendy side to side. The above arrangement minimizes the swing of the trailer when on the jacks.
Hopefully, even with my much less than perfect English, you get the picture of what am I trying to say and that helps somebody.
BTW. Forgot to ad at first; most car scissor jacks extend to less than 12" and have rather small bases. Just get a bunch of 1' square 3/4" plywood pieces to put / stack up under the jacks. Shellack them well and they will last forever and will support your egg even on a soft sand.