I plan on getting this one at TSC this weekend:
Bulldog Tubular Swivel Mount Jack - 1161655 | Tractor Supply Company
Most of the jacks I have considered only go to 21" total height. (The others were too expensive)The bottom of my frame when hooked to the truck is 21". So, I don't think those jacks will lift the tongue at all. Be just like the regular landing leg, unless I always carry a block or two to put under it.
The jack on the link also only goes to 21" BUT I can add an extension pipe to it. Still will only be 11 inches of travel but that travel will start at 16" and go to 27"
Could still add wheels if you wanted. With the correct diameter extension pipe, this would fit, I think.
Bulldog Trailer Jack Caster Assembly - 1840039 | Tractor Supply Company
BUT: it will reduce a 2000lb rated jack to a 800lb max rating.