I am pretty handy and fix much on my own, and my dad is a retired RV service tech.
However, I still bought the warranty. We have the ON SITE Camping World/Good Sam warranty. Ours is 7 years and was about $2300. We are seasonal and use our unit EVERY weekend in the summer and if the slide binds or fridge quits (it runs ALL summer), the warranty pays for itself. There are quite a few big-ticket mechanical items, so we felt it was worth the money.
Eddy & Brenda
2015 Silverado HD 6.0L
2014 Zinger 32QB