i have a kubota 7040sude fel 4x4 loaded rear tires cast centers 2 rear remotes open station gear tranny i bought the tractor new i got 52 hrs on it with a few dings in it should i trade it in on a case 75A i like the front diff lock the extra 1000ibs weight of the case the kubota doesnt do what i want of it the tractor will not pull a 16'' whole tree about 50 to 60 foot long