If you can get a T-1275 to fit, should do a little bit better. Just stay away from sucking a full 75 amps off of it between recharge cycles, and the life should increase measurably in days. I'd try to keep max draw no more than 60 amps out of it.
I'd also figure out right quick what it takes to get it near top charge darn near daily, Voltage wise. The T-1275 will take low amps and time to get that top charge back into it.
Hope it fits in your RV.
The 150W poly solar panel makes about 8.5 to 9 amps, and appears to be a perfect match for my T-1275 when aimed several times a day, portable style.