Hi,
Something that is close to 10 years old, and the seams on the roof might need to be resealed, and perhaps coat the whole roof, before it gets into to bad of shape. This applies to all RV's not just motorhomes or trailers.
I have heard that the 'early' V10 Fords have problems with the spark plugs. They did not design in enough threads to the heads, so there is something like 4 threads. IF you are used to installing spark plugs in a cast iron head, and can tighten them as much as you like, the aluminum heads the spark plug will bottom out, and then remove all the threads that are cut into the aluminum unless you torque them to only the factory specs! This is critical.
By 2003 I think they had re-designed the heads, and they are much more robust, with more threads, and poping out the spark plugs does not happen with the newer V10's.
Are you thinking class C or class A? Class A does not offer the overhead bunk bed, and has a GVWR from 18,000 to 22,000 pounds. Normal lengths start close to 30 feet, and go up from there. Class C is slightly smaller, but can reach 22' to 34' long. Their GVWR is limited to about 14,050 pounds, so they must be build shorter and lighter. And the class C will have much less cargo carrying capacity. If you plan on towing a trailer with dirt bikes, or something with a heavy hitch weight, that is very important. IF you plan to keep it light, and not carry a bunch of friends along, you will be fine with either.
There are a lot of pro's and con's for both motorhomes. Typically the class A will be taller, and push more wind, heavier and get about 7 - possibly 8 MPG. The class C is slightly more aerodynamic, and might be getting 10 MPG from the typical Ford V10, if you drive it around 60 MPH.
Parking a 24' class C in a sightseeing are is no problem. In fact I took my 27' class C to many sightseeing areas, and parked it easy. My 30' class A, I am just as happy to have the ability to tow a car, it has plenty of extra power, and frame strength (that the GM class C lacked) and take the car to the market, or sightseeing.
Good luck on your decision! Be sure to write back a couple of times, and say something like "We picked out a Shasta 26' class C what do you think" and someone might chime in that they loved that brand, or hated it and give some advice as to what to look for.
Fred.