SRMBAKER,
I just replaced all of the slide wipers and "D" seals on our coach. There are several things you need to watch for.
1 - Heartland uses different sizes on some of the slides , so when you call have your vin number as well as the sizes you need.
2 - The "D" seals are pretty easy to change as there are only 2 screws holding them in place one at the top and on at the bottom. Look for a small slit at each end and you will find the screw. Once you remove the screws at the top and bottom they just slide out of the track.
3 - I would suggest ordering a few extra screws because several will break and/or strip on you
4 - If you don't have an impact gun or a cordless drill get on because there are ALOT of screws to take out and put in, it makes the job easier. All of the screws are square head and they will round out on you.
5 - I found if you have an awl or some other device to punch a hole in the slide wiper to make a hole you can put the screw in it makes the job go faster.
If you have any other questions/problems send me a PM or email I will help.
Have fun
dave