It doesn't scare me but I would have never thought about the extra expense and time and what the plan B would be if the load walls couldn't support that weight! 

In addition, if you purchases an SUV or truck with a Gross Vehicle Weight Rating (GVWR) in excess of 6,000lbs, you may be able to deduct depreciation expenses of up to $25,000.

Any thoughts on how I should weight these options?

I have seen Zestimate values at 10% of asking price (Z 650k Asking price 6 million), and I have to put a lot more weight on the person/realtor that has gone through the property, seen property condition/upgrades, and done comps vs extrapolating from sales in a radius.

if the roof doesn't leak, is well sealed laying well and you're replacing due to hail damage, a roof over may work just fine for a long time, and generally on higher pitched roofs, wouldn't do it on 3/12 or less.If you do a roof over, inspect the collar ties (cross tie between rafters at the upper 1/3 of the rafter just below the ridge) and ceiling joists properly tied into top plates, as there will be more weight to bear. 

Account Closed brings up a good point, if he only cares about a few of the factors he may want to see a weighted average based on only a few of his desired factors.

@Jon Holdman, good point about reduction in limit. 

In other words, you should be able to weight in all the pro's and con's of an investment and decide if it plays in your favor. 

If the solar system is leased or it is a PPA then the solar system will not be appraised.In mitigation of that there is the "subjective" which would relate to local views on the aesthetics of solar panels as well as how much of a reduction in ownership costs has been created as a result of the solar system.I am sure you are correct in the latter subjective cost of ownership being increasingly a factor as utility costs rise inexorably.

It also applies to trucks or SUV’s over a certain weight.