I don't think most Class A motorhomes will support a 5,000lb vehicle, especially if also on a tow dolly or trailer - many diesel coaches of that length don't support near that.
I also will respond to your 'concern' about length and National parks - that is not the 'length' of the motorhome they are referring to, but more a length of a towed CAMPER, with the TOW VEHICLE parked in front of it. So if they state 35' maximum RV length, what they are really talking about is the RV, not also the tow vehicle, which is another 15 or so feet, at least. These sites are probably more 45' to 50' in depth, not 35'. If you have a 35' RV, you'd still have room for a towed car parked in front of it, and still have plenty more room.
I've found that most site length 'limitation' claims are not 'real depths' of sites, but more of a 'guide' so that a truck, pulling a 40' fifth wheel, doesn't reserve a site that might have the truck sitting on the roadway. That same truck pulling a 35' fifth wheel will fit just fine.
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