I know what you mean, I had a Case 1840 about 4 years ago and it was a great machine, EXCEPT in the mud, then forget it, youre stuck. I went on eBay and bought a set of steel over the wheel tracks (I think TracksPlus, but Im not sure) at that time I paid $1500 for a set. Boy, this was like night and day, this thing was like a little bulldozer. Now this is what I learned
1. have the tires filled with foam or a tire sealant. If a tire goes flat, then you have to take the tracks off in the field and thats not pretty
2. If you work the machine hard in the mud and the tracks are slack, they will slip and wear the tires out, so keep them properly adjusted
3. Adjusting, this is just my opinion and experiences. I use a strap binder, to pull the ends together, you will learn where the best place to hook the ends up/together. I think it took me 2 hours for the first time, then it only took less than 30 minutes per side. If you need, a little bit of slack to get the bolts, deflat one or both tires, if they are inflated. Then inflate, if the tracks are too tight, they will cause issues with the wheel bearings, so be careful.
4. The steel tracks will scar the asphaut driveways, but unless you are real hard on it, it will not cause damage. On concrete it leaves a temp. mark only. My new rubber tracked machine leaves a mark also, but it comes off.
I did wear a set out, in about a year, now this is using it rough and in rough conditions. Working about 60 hrs a week, in sand and mud, so they must be tough to last me that long. I bought another set and I still didnt have the money that McLaren wanted for their set. A friend of mine, bought a set of rubber over the tire, paid like $3500 (4 years ago) he had all kind of problems with wheel bearings, they would last him about 40 hrs, I think they were too heavy, too much strain on the bearings. He did the same thing I did, we both bought track machines, boy what a great machine, no more flat tires.
Hope this helps, I would go with cheaper set, to see how you like it.
Good Luck