When I first started looking at pumps I was astounded that they offered so little on the warranty. My first thought was that they will probably fail in a year. Why don't they stand behind their work??
If your going to continue with a MH/Toad I recommend you go to the FMCA web and look at Towables with 4 on the floor. They come out with a guide every year. I have them as far back as 2000. When and if I trade my present towable I will get another towable. That is if I still have the MH. Sorry about your pumps.
98 Endeavor DP, ISB275
RX300, Falcon II hitch, BB Vantage Select
VMSpc, 2002 Grey Ford Powerstroke
TST 507 w/ 10 Sensors