my brother-in-law (BIL) agreed to let me use his trailer for mowing. if, i would discount his weekly lawn mowing. this is my second year mowing for him and using his trailer. then, one day he says to stop mowing for a while till i get caught up with the money. i sent him invoices at the end of the month. 2-1/2 months go by and he never pays but hey he is my BIL and he is letting me use his trailer. so, i let it go for awhile. then, i finally get a check for $75. he writes on the pay stub, credits for using his trailer and some lawn damage. i'm thinking what the... so i just give him back the trailer and stop mowing. he still owes me $225. but, i'm not getting it from him because he says you used my trailer and you owe me wear and tear on it. what would you guys do in this situation?