[Lonestar38ZRC]

I’m the new owner of coach #606, and rather quickly trying to work through some maintenance items. The biggest item I am working on being the slide out seals. I’ve researched extensively what it takes to replace them, and although I feel I could tackle this task, I don’t want to get in a bind and mess up or have to do the repair twice. I reached out to Motorhomes of Texas and had them shoot me a rough estimate for all 4 seals.  My expectation was to pay around $1200-$1300 each for the material, and $2500+/- each for labor.  
MOT just quoted me a little over $3k each for the seals, and over $4k each for labor. Grand total right at $30k. 
Has anyone recently completed this repair?  Are my expectations way out of line?