Carterjon

Thank you so much for you guys' advices, due to my lack of hands-on skills, I have now decided to take it to the dealer to have a look

Yes I did remove the air condition before

Sorry another pic is failed, will try to update again

Replaced my broken side marker lights on my RV with these LED lights from AUXITO. The stick on cushion backing had the holes already cut out so the ease in which they mounted was effortless. Comes with the mounting screws and wiring to make replacement a breeze! My application was for replacement, if yours is for a new placement then you can use the cushion backings to mark placement or use to make a template to mark the holes you will need to drill out. A 1/8th drill bit should do the trick for the mounting screws and a 9/64th bit seems to make the wiring holes perfectly. I had them ready just in case I needed to re-drill anything.
After installing I tried them and man they are BRIGHT! Those 4 LED's will definitely do the job over the bulb markers they replaced. Now LED's cover the back end and provides the people behind me a real good view even in daylight to avoid getting hit.

Plan to Salt Lake too 

Thank you for that information RV_

Can you see the sagging part? 

Thank you for the reply, It's an 84 itasca motorhome, I know that's a big deal, so I just try to see if there's a good way to fix it

I have a 84 motorhome, previous owners said it sat for 11 years.

The roof is sagging a bit, maybe half an inch at deepest, as a result, rainwater/ A/C pools up on top. And I am worried for the snow. I can put a tarp on it for now. It doesnt seem to leak yet, but I am sure it is just hidden.

How bad is it, from scale of totaled to diy fix in garage?

Also, how can I be sure the right sealant to get. It has aluminum pieces. Thanks, I am broke and cant pay a better dude than me. Might as well try or nothing.