I have about 110 gallons of RimGuard in a pair of 17.5L24 R4 tires, probably a little over 1100 lbs.
I also have a pair of unloaded 44x18x20 turf tires for "summer".
I generally try to use the loaded R4s for Winter and Spring, the Turfs for Summer and Fall, but this year got caught needing to do back hoe and tiller work while the turfs were still on.
I was pleasantly surprised; the hoe probably weighs as much as the tire ballast and it's weight is farther back. I was able to push dirt around quite well with the unloaded turf tires on, to about the limit that I am willing to use that particular tractor as a dozer, whatever tires are on it.
I'm not suggesting that turfs are in any way IDEAL for real field work, or absolute mud holes, but if the ground is reasonably dry and NOT clay they work quite well without ballast.
I have changed over to the loaded R4s again, snow has started.
I will SUGGEST that you try them unloaded, with the hoe on you should have significant ground pressure.
Once loaded it would be difficult, or at least awkward, to unload them.
====================================
Another alternative would be to get two wheel sets as part of the initial "deal".
I got my turfs separately, but you could probably get a better bundled price.